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List of Counties

List of Municipalities

List of Regions

List of Towns/Cities

B
- Bailey in Park County, Colorado, is an unincorporated town served by U.S. Post Office 80421
- The Town of Basalt in Eagle County & Pitkin County, Colorado, is a Statutory Town served by U.S. Post Office 81621
- Battlement Mesa in Garfield County, Colorado, is an unincorporated town and a Census Designated Place served by U.S. Post Office 81636
- The Town of Bayfield in La Plata County, Colorado, is a Statutory Town served by U.S. Post Office 81122
- Beaver Creek in Eagle County, Colorado, is an unincorporated community and a postal address served by the Avon U.S. Post Office 81620
- Bedrock in Montrose County, Colorado, is an unincorporated town served by U.S. Post Office 81411
- Bellvue in Larimer County, Colorado, is an unincorporated town served by U.S. Post Office 80512
- The Town of Bennett in Adams County & Arapahoe County, Colorado, is a Statutory Town served by U.S. Post Office 80102
- Berkley in Adams County, Colorado, is an unincorporated community and a Census Designated Place served by the Denver U.S. Post Office 80221
- The Town of Berthoud in Larimer County & Weld County, Colorado, is a Statutory Town served by U.S. Post Office 80513
- The Town of Bethune in Kit Carson County, Colorado, is a Statutory Town served by U.S. Post Office 80805
- Beulah in Pueblo County, Colorado, is an unincorporated town served by U.S. Post Office 81023
- Beulah Valley in Pueblo County, Colorado, is an unincorporated community and a Census Designated Place served by the Beulah U.S. Post Office 81023
- Black Forest in El Paso County, Colorado, is an unincorporated community and a Census Designated Place served by the Colorado Springs U.S. Post Office 80908 and Elbert U.S. Post Office 80106
- The City of Black Hawk in Gilpin County, Colorado, is a Home Rule Municipality served by U.S. Post Office 80422
- The Town of Blanca in Costilla County, Colorado, is a Statutory Town served by U.S. Post Office 81123
- The Town of Blue River in Summit County, Colorado, is a Statutory Town and a postal address served by the Breckenridge U.S. Post Office 80424
- The Town of Bonanza in Saguache County, Colorado, is a Statutory Town served by the Villa Grove U.S. Post Office 81155
- Boncarbo in Las Animas County, Colorado, is an unincorporated town served by U.S. Post Office 81024
- Bond in Eagle County, Colorado, is an unincorporated town served by U.S. Post Office 80423
- The Town of Boone in Pueblo County, Colorado, is a Statutory Town served by U.S. Post Office 81025
- The City of Boulder in Boulder County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 80301-80329
- The Town of Bow Mar in Arapahoe County & Jefferson County, Colorado, is a Statutory Town and a postal address served by the Littleton U.S. Post Office 80123
- Boyero in Lincoln County, Colorado, is an unincorporated community and a postal address served by the Hugo U.S. Post Office 80821
- Brandon in Kiowa County, Colorado, is an unincorporated community and a postal address served by the Sheridan Lake U.S. Post Office 81071
- The Town of Branson in Las Animas County, Colorado, is a Statutory Town served by U.S. Post Office 81027
- The Town of Breckenridge in Summit County, Colorado, is a Home Rule Municipality served by U.S. Post Office 80424
- Briggsdale in Weld County, Colorado, is an unincorporated town served by U.S. Post Office 80611
- The City of Brighton in Adams County & Weld County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 80601-80603
- Bristol in Prowers County, Colorado, is an unincorporated community and a postal address served by the Holly U.S. Post Office 81047
- The Town of Brookside in Fremont County, Colorado, is a Statutory Town and a postal address served by the Ca�on City U.S. Post Office 81212
- The City and County of Broomfield, Colorado, is a Consolidated City and County served by U.S. Post Offices 80020-80021 & 80038
- The City of Brush in Morgan County, Colorado, is a Statutory City served by U.S. Post Office 80723
- The Town of Buena Vista in Chaffee County, Colorado, is a Statutory Town served by U.S. Post Office 81211
- Buffalo Creek in Jefferson County, Colorado, is an unincorporated town served by U.S. Post Office 80425
- The City of Burlington in Kit Carson County, Colorado, is a Home Rule Municipality served by U.S. Post Office 80807
- Burns in Eagle County, Colorado, is an unincorporated town served by U.S. Post Office 80426
- Byers in Arapahoe County, Colorado, is an unincorporated town and a Census Designated Place served by U.S. Post Office 80103

C
- Caddoa in Bent County, Colorado, is an unincorporated community and a postal address served by the Hasty U.S. Post Office 81044
- Cadet Station in El Paso County, Colorado, is a postal address served by the United States Air Force Academy U.S. Post Office 80841
- Cahone in Dolores County, Colorado, is an unincorporated town served by U.S. Post Office 81320
- The Town of Calhan in El Paso County, Colorado, is a Statutory Town served by U.S. Post Office 80808
- Campion in Larimer County, Colorado, is an unincorporated community and a Census Designated Place served by the Loveland U.S. Post Office 80537
- The Town of Campo in Baca County, Colorado, is a Statutory Town served by U.S. Post Office 81029
- The City of Ca�on City in Fremont County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 81212-81215
- Capulin in Conejos County, Colorado, is an unincorporated town served by U.S. Post Office 81124
- The Town of Carbondale in Garfield County, Colorado, is a Home Rule Municipality served by U.S. Post Office 81623
- Carr in Weld County, Colorado, is an unincorporated town served by U.S. Post Office 80612
- Carriage Club in Douglas County, Colorado, is an unincorporated community and a Census Designated Place served by the Littleton U.S. Post Office 80124
- Cascade in El Paso County, Colorado, is an unincorporated town served by U.S. Post Office 80809
- Cascade-Chipita Park in El Paso County, Colorado, is a Census Designated Place served by the Cascade U.S. Post Office 80809
- Castle Pines in Douglas County, Colorado, is a Census Designated Place served by the Castle Rock U.S. Post Office 80104
- The City of Castle Pines North in Douglas County, Colorado, is an Home Rule Municipality served by the Castle Rock U.S. Post Office 80104
- Castle Pines Village in Douglas County, Colorado, is an unincorporated community proposed for incorporation as a Home Rule Municipality and served by the Castle Rock U.S. Post Office 80104
- The Town of Castle Rock in Douglas County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 80104 & 80108-80109
- Castlewood in Arapahoe County, Colorado, is a defunct Census Designated Place that is now a part of the City of Centennial
- The Town of Cedaredge in Delta County, Colorado, is a Statutory Town served by U.S. Post Office 81413
- The City of Centennial in Arapahoe County, Colorado, is a Statutory City and a postal address served by the Littleton U.S. Post Offices 80121-80122 & 80161, Englewood U.S. Post Offices 80111-80112, and Aurora U.S. Post Offices 80015-80016
- The Town of Center in Rio Grande County & Saguache County, Colorado, is a Statutory Town served by U.S. Post Office 81125
- The City of Central City in Gilpin County & Clear Creek County, Colorado, is a Home Rule Municipality served by U.S. Post Office 80427
- Chama in Costilla County, Colorado, is an unincorporated town served by U.S. Post Office 81126
- The Town of Cheraw in Otero County, Colorado, is a Statutory Town served by U.S. Post Office 81030
- The City of Cherry Hills Village in Arapahoe County, Colorado, is a Home Rule Municipality and a postal address served by the Englewood U.S. Post Offices 80110-80111 & 80113 and by the Littleton U.S. Post Office 80121
- The Cheyenne Mountain Directorate in El Paso County, Colorado, is a former U.S. Air Force base and a postal address served by the Colorado Springs U.S. Post Office 80914
- The Town of Cheyenne Wells in Cheyenne County, Colorado, is a Statutory Town served by U.S. Post Office 80810
- Chimney Rock in Archuleta County, Colorado, is an unincorporated town served by U.S. Post Office 81127
- Chivington in Kiowa County, Colorado, is an unincorporated community and a postal address served by the Eads U.S. Post Office 81036
- Chromo in Archuleta County, Colorado, is an unincorporated town served by U.S. Post Office 81128
- Cimarron in Montrose County, Colorado, is an unincorporated town served by U.S. Post Office 81220
- Cimarron Hills in El Paso County, Colorado, is an unincorporated community and a Census Designated Place served by the Colorado Springs U.S. Post Offices 80915 & 80922 & 80970
- Clark in Routt County, Colorado, is an unincorporated town served by U.S. Post Office 80428
- Clifton in Mesa County, Colorado, is an unincorporated town and a Census Designated Place served by U.S. Post Office 81520
- Climax in Lake County, Colorado, is an unincorporated town served by U.S. Post Office 80429
- The Town of Coal Creek in Fremont County, Colorado, is a Statutory Town served by U.S. Post Office 81221
- Coal Creek in Jefferson County & Boulder County & Gilpin County, Colorado, is an unincorporated community and a Census Designated Place served by the Golden U.S. Post Office 80403
- Coaldale in Fremont County, Colorado, is an unincorporated town served by U.S. Post Office 81222
- Coalmont in Jackson County, Colorado, is an unincorporated town served by U.S. Post Office 80430
- The Town of Cokedale in Las Animas County, Colorado, is a Statutory Town and a postal address served by the Trinidad U.S. Post Office 81082
- The Town of Collbran in Mesa County, Colorado, is a Statutory Town served by U.S. Post Office 81624
- Colorado City in Pueblo County, Colorado, is an unincorporated town and a Census Designated Place served by U.S. Post Office 81019
- The City of Colorado Springs in El Paso County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 80901-80997
- Columbine in Jefferson County & Arapahoe County, Colorado, is an unincorporated community and a Census Designated Place served by the Littleton U.S. Post Office 80123
- The Town of Columbine Valley in Arapahoe County, Colorado, is a Statutory Town and a postal address served by the Littleton U.S. Post Office 80123
- The City of Commerce City in Adams County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 80022 & 80037
- Como in Park County, Colorado, is an unincorporated town served by U.S. Post Office 80432
- Conejos in Conejos County, Colorado, is an unincorporated town served by U.S. Post Office 81129
- Conifer in Jefferson County, Colorado, is an unincorporated town served by U.S. Post Office 80433
- Cope in Washington County, Colorado, is an unincorporated town served by U.S. Post Office 80812
- Cordillera in Eagle County, Colorado, is an unincorporated community and a postal address served by the Edwards U.S. Post Office 81632
- The City of Cortez in Montezuma County, Colorado, is a Home Rule Municipality served by U.S. Post Office 81321
- Cory in Delta County, Colorado, is an unincorporated town served by U.S. Post Office 81414
- Cotopaxi in Fremont County, Colorado, is an unincorporated town served by U.S. Post Office 81223
- Cottonwood in Douglas County, Colorado, is an unincorporated community and a Census Designated Place served by the Parker U.S. Post Office 80134
- Cowdrey in Jackson County, Colorado, is an unincorporated town served by U.S. Post Office 80434
- The City of Craig in Moffat County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 81625-81626
- The Town of Crawford in Delta County, Colorado, is a Statutory Town served by U.S. Post Office 81415
- The Town of Creede in Mineral County, Colorado, is a Statutory Town served by U.S. Post Office 81130
- The Town of Crested Butte in Gunnison County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 81224-81225
- The Town of Crestone in Saguache County, Colorado, is a Statutory Town served by U.S. Post Office 81131
- The City of Cripple Creek in Teller County, Colorado, is a Statutory City served by U.S. Post Office 80813
- The Town of Crook in Logan County, Colorado, is a Statutory Town served by U.S. Post Office 80726
- The Town of Crowley in Crowley County, Colorado, is a Statutory Town served by U.S. Post Offices 81033-81034
- Crystola in Teller County, Colorado, is an unincorporated town served by U.S. Post Office 80863

D
- The City of Dacono in Weld County, Colorado, is a Home Rule Municipality served by U.S. Post Office 80514
- The Town of De Beque in Mesa County, Colorado, is a Statutory Town served by U.S. Post Office 81630
- Deckers in Douglas County & Jefferson County, Colorado, is an unincorporated community and a postal address served by the Sedalia U.S. Post Office 80135
- The Town of Deer Trail in Arapahoe County, Colorado, is a Statutory Town served by U.S. Post Office 80105
- The Town of Del Norte in Rio Grande County, Colorado, is a Statutory Town served by U.S. Post Office 81132
- Delhi in Las Animas County, Colorado, is an unincorporated community and a postal address served by the Model U.S. Post Office 81059
- The City of Delta in Delta County, Colorado, is a Home Rule Municipality served by U.S. Post Office 81416
- The City and County of Denver, Colorado, is a Consolidated City and County served by U.S. Post Offices 80201-80299
- Deora in Baca County, Colorado, is an unincorporated community and a postal address served by the Las Animas U.S. Post Office 81054
- Derby in Adams County, Colorado, is an unincorporated community and a Census Designated Place served by the Commerce City U.S. Post Offices 80022
- The Town of Dillon in Summit County, Colorado, is a Home Rule Municipality served by U.S. Post Office 80435
- The Town of Dinosaur in Moffat County, Colorado, is a Statutory Town served by U.S. Post Offices 81610 & 81633
- Divide in Teller County, Colorado, is an unincorporated town served by U.S. Post Office 80814
- The Town of Dolores in Montezuma County, Colorado, is a Statutory Town served by U.S. Post Office 81323
- The Town of Dove Creek in Dolores County, Colorado, is a Statutory Town served by U.S. Post Office 81324
- Downieville in Clear Creek County, Colorado, is an unincorporated community served by the Dumont U.S. Post Office 80436
- Downieville-Lawson-Dumont in Clear Creek County, Colorado, is a Census Designated Place served by the Dumont U.S. Post Office 80436
- Drake in Larimer County, Colorado, is an unincorporated town served by U.S. Post Office 80515
- Dumont in Clear Creek County, Colorado, is an unincorporated town served by U.S. Post Office 80436
- Dupont in Adams County, Colorado, is an unincorporated town served by U.S. Post Office 80024
- The City of Durango in La Plata County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 81301-81303

E
- The Town of Eads in Kiowa County, Colorado, is a Statutory Town served by U.S. Post Office 81036
- The Town of Eagle in Eagle County, Colorado, is a Statutory Town served by U.S. Post Office 81631
- Eagle-Vail in Eagle County, Colorado, is an unincorporated community and a Census Designated Place served by the Avon U.S. Post Office 81620
- East Pleasant View in Jefferson County, Colorado, is an unincorporated community and a Census Designated Place served by the Golden U.S. Post Office 80401
- Eastlake in Adams County, Colorado, is an unincorporated town served by U.S. Post Office 80614
- The Town of Eaton in Weld County, Colorado, is a Statutory Town served by U.S. Post Office 80615
- Eckert in Delta County, Colorado, is an unincorporated town served by U.S. Post Office 81418
- The Town of Eckley in Yuma County, Colorado, is a Statutory Town served by U.S. Post Office 80727
- The City of Edgewater in Jefferson County, Colorado, is a Home Rule Municipality and a postal address served by the Denver U.S. Post Office 80214
- Edwards in Eagle County, Colorado, is an unincorporated town and a Census Designated Place served by U.S. Post Office 81632
- Egnar in San Miguel County, Colorado, is an unincorporated town served by U.S. Post Office 81325
- El Jebel in Eagle County, Colorado, is an unincorporated community and a Census Designated Place and a postal address served by the Carbondale U.S. Post Office 81623
- Elbert in El Paso County, Colorado, is an unincorporated town served by U.S. Post Office 80106
- Eldora in Boulder County, Colorado, is an unincorporated community and a Census Designated Place served by the Nederland U.S. Post Office 80466
- Eldorado Springs in Boulder County, Colorado, is an unincorporated town and a Census Designated Place served by U.S. Post Office 80025
- The Town of Elizabeth in Elbert County, Colorado, is a Statutory Town served by U.S. Post Office 80107
- Elk Springs in Moffat County, Colorado, is an unincorporated community and a postal address served by the Dinosaur U.S. Post Office 81633
- The Town of Empire in Clear Creek County, Colorado, is a Statutory Town served by U.S. Post Office 80438
- The City of Englewood in Arapahoe County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 80110-80113 & 80150-80155
- The Town of Erie in Boulder County & Weld County, Colorado, is a Statutory Town served by U.S. Post Office 80516
- The Town of Estes Park in Larimer County, Colorado, is a Statutory Town served by U.S. Post Offices 80511 & 80517
- The City of Evans in Weld County, Colorado, is a Home Rule Municipality served by U.S. Post Office 80620
- Evergreen in Jefferson County, Colorado, is an unincorporated community and a Census Designated Place served by U.S. Post Offices 80437 & 80439

F
- The Town of Fairplay in Park County, Colorado, is a Statutory Town served by U.S. Post Office 80440
- Farista in Huerfano County, Colorado, is an unincorporated community and a postal address served by the Walsenburg U.S. Post Office 81089
- The City of Federal Heights in Adams County, Colorado, is a Statutory City and a postal address served by the Denver U.S. Post Offices 80221& 80260
- The Town of Firestone in Weld County, Colorado, is a Statutory Town served by U.S. Post Office 80520
- The Town of Flagler in Kit Carson County, Colorado, is a Statutory Town served by U.S. Post Office 80815
- The Town of Fleming in Logan County, Colorado, is a Statutory Town served by U.S. Post Office 80728
- The City of Florence in Fremont County, Colorado, is a Statutory City served by U.S. Post Offices 81226 & 81290
- Florissant in Teller County, Colorado, is an unincorporated town served by U.S. Post Office 80816
- Fort Carson in El Paso County & Pueblo County & Fremont County, Colorado, is a U.S. Army base, a Census Designated Place, and a postal address served by the Colorado Springs U.S. Post Office 80913
- The City of Fort Collins in Larimer County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 80521-80528 & 80553
- Fort Garland in Costilla County, Colorado, is an unincorporated town and a Census Designated Place served by U.S. Post Office 81133
- The City of Fort Lupton in Weld County, Colorado, is a Statutory City served by U.S. Post Office 80621
- Fort Lyon in Bent County, Colorado, is an unincorporated town served by U.S. Post Office 81038
- The City of Fort Morgan in Morgan County, Colorado, is a Home Rule Municipality served by U.S. Post Office 80701
- The City of Fountain in El Paso County, Colorado, is a Home Rule Municipality served by U.S. Post Office 80817
- The Town of Fowler in Otero County, Colorado, is a Statutory Town served by U.S. Post Office 81039
- The Town of Foxfield in Arapahoe County, Colorado, is a Statutory Town and a postal address served by the Aurora U.S. Post Office 80016
- Foxton in Jefferson County, Colorado, is an unincorporated community and a postal address served by the Conifer U.S. Post Office 80433
- Franktown in Douglas County, Colorado, is an unincorporated town and a Census Designated Place served by U.S. Post Office 80116
- The Town of Fraser in Grand County, Colorado, is a Statutory Town served by U.S. Post Office 80442
- The Town of Frederick in Weld County, Colorado, is a Statutory Town served by U.S. Post Office 80530
- The Town of Frisco in Summit County, Colorado, is a Home Rule Municipality served by U.S. Post Office 80443
- The City of Fruita in Mesa County, Colorado, is a Home Rule Municipality served by U.S. Post Office 81521
- Fruitvale in Mesa County, Colorado, is an unincorporated community and a Census Designated Place and a postal address served by the Grand Junction U.S. Post Offices 81504

G
- Galeton in Weld County, Colorado, is an unincorporated town served by U.S. Post Office 80622
- Garcia in Costilla County, Colorado, is an unincorporated town served by U.S. Post Office 81134
- The Town of Garden City in Weld County, Colorado, is a Statutory Town and a postal address served by the Greeley U.S. Post Offices 80631
- Gardner in Huerfano County, Colorado, is an unincorporated town served by U.S. Post Office 81040
- Gateway in Mesa County, Colorado, is an unincorporated town served by U.S. Post Office 81522
- Genesee in Jefferson County, Colorado, is an unincorporated community and a Census Designated Place served by the Golden U.S. Post Office 80401
- The Town of Genoa in Lincoln County, Colorado, is a Statutory Town served by U.S. Post Office 80818
- The Town of Georgetown in Clear Creek County, Colorado, is the only remaining Colorado Territorial Charter Municipality and is served by U.S. Post Office 80444
- The Town of Gilcrest in Weld County, Colorado, is a Statutory Town served by U.S. Post Office 80623
- Gill in Weld County, Colorado, is an unincorporated town served by U.S. Post Office 80624
- Gilman in Eagle County, Colorado, is an unincorporated community and a postal address served by the Minturn U.S. Post Office 81645
- Glade Park in Mesa County, Colorado, is an unincorporated town served by U.S. Post Office 81523
- Glen Haven in Larimer County, Colorado, is an unincorporated town served by U.S. Post Office 80532
- The City of Glendale in Arapahoe County, Colorado, is a Home Rule Municipality and a postal address served by the Denver U.S. Post Offics 80246
- Gleneagle in El Paso County, Colorado, is an unincorporated community and a Census Designated Place served by the Colorado Springs U.S. Post Office 80921
- The City of Glenwood Springs in Garfield County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 81601-81602
- Gold Hill in Boulder County, Colorado, is an unincorporated community and a Census Designated Place served by the Boulder U.S. Post Office 80302
- The City of Golden in Jefferson County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 80401-80419
- Gould in Jackson County, Colorado, is an unincorporated community
- The Town of Granada in Prowers County, Colorado, is a Statutory Town served by U.S. Post Office 81041
- The Town of Granby in Grand County, Colorado, is a Statutory Town served by U.S. Post Office 80446
- The City of Grand Junction in Mesa County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 81501-81506
- The Town of Grand Lake in Grand County, Colorado, is a Statutory Town served by U.S. Post Office 80447
- Grand View Estates in Douglas County, Colorado, is an unincorporated community and a Census Designated Place served by the Parker U.S. Post Office 80134
- Granite in Chaffee County, Colorado, is an unincorporated town served by U.S. Post Office 81228
- Grant in Park County, Colorado, is an unincorporated town served by U.S. Post Office 80448
- Great Sand Dunes National Park and Preserve in Alamosa County & Saguache County, Colorado, is a postal address served by the Alamosa U.S. Post Office 81101
- The City of Greeley in Weld County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 80631-80639
- The Town of Green Mountain Falls in El Paso County & Teller County, Colorado, is a Statutory Town served by U.S. Post Office 80819
- The City of Greenwood Village in Arapahoe County, Colorado, is a Home Rule Municipality and a postal address served by the Englewood U.S. Post Offices 80110-80112 and Littleton U.S. Post Offices 80121 & 80155
- The Town of Grover in Weld County, Colorado, is a Statutory Town served by U.S. Post Office 80729
- Guffey in Park County, Colorado, is an unincorporated town served by U.S. Post Office 80820
- Gunbarrel in Boulder County, Colorado, is an unincorporated community and a Census Designated Place served by the Boulder U.S. Post Office 80301
- The City of Gunnison in Gunnison County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 81230-81231 & 81247
- The Town of Gypsum in Eagle County, Colorado, is a Home Rule Municipality served by U.S. Post Office 81637

H
- Hale in Yuma County, Colorado, is an unincorporated community and a postal address served by the Idalia U.S. Post Office 80735
- Hamilton in Moffat County, Colorado, is an unincorporated town served by U.S. Post Office 81638
- The Town of Hartman in Prowers County, Colorado, is a Statutory Town served by U.S. Post Office 81043
- Hartsel in Park County, Colorado, is an unincorporated town served by U.S. Post Office 80449
- Hasty in Bent County, Colorado, is an unincorporated town served by U.S. Post Office 81044
- The Town of Haswell in Kiowa County, Colorado, is a Statutory Town served by U.S. Post Office 81045
- The Town of Haxtun in Phillips County, Colorado, is a Statutory Town served by U.S. Post Office 80731
- The Town of Hayden in Routt County, Colorado, is a Statutory Town served by U.S. Post Office 81639
- Heeney in Summit County, Colorado, is an unincorporated community and a postal address served by the Silverthorne U.S. Post Office 80498
- Henderson in Adams County, Colorado, is an unincorporated town served by U.S. Post Office 80640
- Hereford in Weld County, Colorado, is an unincorporated town served by U.S. Post Office 80732
- Heritage Hills in Douglas County, Colorado, is an unincorporated community and a Census Designated Place served by the Littleton U.S. Post Office 80124
- Hesperus in La Plata County, Colorado, is an unincorporated town served by U.S. Post Office 81326
- Highlands Ranch in Douglas County, Colorado, is an unincorporated city, a Census Designated Place, and a postal address served by the Littleton U.S. Post Offices 80126 & 80129-80130 & 80163
- The Town of Hillrose in Morgan County, Colorado, is a Statutory Town served by U.S. Post Office 80733
- Hillside in Fremont County, Colorado, is an unincorporated town served by U.S. Post Office 81232
- Hoehne in Las Animas County, Colorado, is an unincorporated town served by U.S. Post Office 81046
- The Town of Holly in Prowers County, Colorado, is a Statutory Town served by U.S. Post Office 81047
- The City of Holyoke in Phillips County, Colorado, is a Home Rule Municipality served by U.S. Post Office 80734
- Homelake in Rio Grande County, Colorado, is an unincorporated town served by U.S. Post Office 81135
- The Town of Hooper in Alamosa County, Colorado, is a Statutory Town served by U.S. Post Office 81136
- The Town of Hot Sulphur Springs in Grand County, Colorado, is a Statutory Town served by U.S. Post Office 80451
- The Town of Hotchkiss in Delta County, Colorado, is a Statutory Town served by U.S. Post Office 81419
- Howard in Fremont County, Colorado, is an unincorporated town served by U.S. Post Office 81233
- Hoyt in Morgan County, Colorado, is an unincorporated community and a postal address served by the Wiggins U.S. Post Office 80654
- The Town of Hudson in Weld County, Colorado, is a Statutory Town served by U.S. Post Office 80642
- The Town of Hugo in Lincoln County, Colorado, is a Statutory Town served by U.S. Post Office 80821
- Hygiene in Boulder County, Colorado, is an unincorporated town served by U.S. Post Office 80533

I
- The City of Idaho Springs in Clear Creek County, Colorado, is a Statutory City served by U.S. Post Office 80452
- Idalia in Yuma County, Colorado, is an unincorporated town served by U.S. Post Office 80735
- Idledale in Jefferson County, Colorado, is an unincorporated town served by U.S. Post Office 80453
- The Town of Ignacio in La Plata County, Colorado, is a Statutory Town served by U.S. Post Office 81137
- The Town of Iliff in Logan County, Colorado, is a Statutory Town served by U.S. Post Office 80736
- Indian Hills in Jefferson County, Colorado, is an unincorporated town and a Census Designated Place served by U.S. Post Office 80454

J
- The Town of Jamestown in Boulder County, Colorado, is a Statutory Town served by U.S. Post Office 80455
- Jansen in Las Animas County, Colorado, is an unincorporated community and a postal address served by the Trinidad U.S. Post Office 81082
- Jaroso in Costilla County, Colorado, is an unincorporated town served by U.S. Post Office 81138
- Jefferson in Park County, Colorado, is an unincorporated town served by U.S. Post Office 80456
- Joes in Yuma County, Colorado, is an unincorporated town served by U.S. Post Office 80822
- The Town of Johnstown in Weld County & Larimer County, Colorado, is a Home Rule Municipality served by U.S. Post Office 80534
- The Town of Julesburg in Sedgwick County, Colorado, is a Statutory Town served by U.S. Post Office 80737

K
- Karval in Lincoln County, Colorado, is an unincorporated town served by U.S. Post Office 80823
- The Town of Keenesburg in Weld County, Colorado, is a Statutory Town served by U.S. Post Office 80643
- Ken Caryl in Jefferson County, Colorado, is an unincorporated community and a Census Designated Place served by the Littleton U.S. Post Office 80128
- The Town of Kersey in Weld County, Colorado, is a Statutory Town served by U.S. Post Office 80644
- Keystone in Summit County, Colorado, is an unincorporated community, a Census Designated Place, and a postal address served by the Dillon U.S. Post Office 80435
- The Town of Kim in Las Animas County, Colorado, is a Statutory Town served by U.S. Post Office 81049
- The Town of Kiowa in Elbert County, Colorado, is a Statutory Town served by U.S. Post Office 80117
- Kirk in Yuma County, Colorado, is an unincorporated town served by U.S. Post Office 80824
- The Town of Kit Carson in Cheyenne County, Colorado, is a Statutory Town served by U.S. Post Office 80825
- Kittredge in Jefferson County, Colorado, is an unincorporated town and a Census Designated Place served by U.S. Post Office 80457
- The Town of Kremmling in Grand County, Colorado, is a Statutory Town served by U.S. Post Office 80459

L
- The Town of La Jara in Conejos County, Colorado, is a Statutory Town served by U.S. Post Office 81140
- The City of La Junta in Otero County, Colorado, is a Home Rule Municipality served by U.S. Post Office 81050
- The Town of La Salle in Weld County, Colorado, is a Statutory Town served by U.S. Post Office 80645
- The Town of La Veta in Huerfano County, Colorado, is a Statutory Town served by U.S. Post Office 81055
- The City of Lafayette in Boulder County, Colorado, is a Home Rule Municipality served by U.S. Post Office 80026
- Laird in Yuma County, Colorado, is an unincorporated community and a postal address served by the Wray U.S. Post Office 80758
- The Town of Lake City in Hinsdale County, Colorado, is a Statutory Town served by U.S. Post Office 81235
- Lake George in Park County, Colorado, is an unincorporated town served by U.S. Post Office 80827
- The Town of Lakeside in Jefferson County, Colorado, is a Statutory Town and a postal address served by the Denver U.S. Post Office 80212
- The City of Lakewood in Jefferson County, Colorado, is a Home Rule Municipality and a postal address served by the Denver U.S. Post Offices 80214-80215 & 80226-80228 & 80232 & 80235-80236, Golden U.S. Post Office 80401, and Littleton U.S. Post Office 80123
- The City of Lamar in Prowers County, Colorado, is a Home Rule Municipality served by U.S. Post Office 81052
- Laporte in Larimer County, Colorado, is an unincorporated town and a Census Designated Place served by U.S. Post Office 80535
- The Town of Larkspur in Douglas County, Colorado, is a Home Rule Municipality served by U.S. Post Office 80118
- The City of Las Animas in Bent County, Colorado, is a Statutory City served by U.S. Post Office 81054
- Last Chance in Washington County, Colorado, is an unincorporated community and a postal address served by the Woodrow U.S. Post Office 80757
- Lawson in Clear Creek County, Colorado, is an unincorporated community served by the Dumont U.S. Post Office 80436
- Lazear in Delta County, Colorado, is an unincorporated town served by U.S. Post Office 81420
- The City of Leadville in Lake County, Colorado, is a Statutory City served by U.S. Post Office 80461
- Leadville North in Lake County, Colorado, is an unincorporated community and a Census Designated Place served by the Leadville U.S. Post Office 80461
- Lewis in Montezuma County, Colorado, is an unincorporated town served by U.S. Post Office 81327
- The Town of Limon in Lincoln County, Colorado, is a Statutory Town served by U.S. Post Offices 80826 & 80828
- Lincoln Park in Fremont County, Colorado, is an unincorporated community and a Census Designated Place served by the Ca�on City U.S. Post Office 81212
- Lindon in Washington County, Colorado, is an unincorporated town served by U.S. Post Office 80740
- The City of Littleton in Arapahoe County & Jefferson County & Douglas County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 80120-80130 & 80160-80166
- Livermore in Larimer County, Colorado, is an unincorporated town served by U.S. Post Office 80536
- The Town of Lochbuie in Weld County & Adams County, Colorado, is a Statutory Town and a postal address served by the Brighton U.S. Post Office 80603
- The Town of Log Lane Village in Morgan County, Colorado, is a Statutory Town served by U.S. Post Office 80705
- Loghill Village in Ouray County, Colorado, is an unincorporated community and a Census Designated Place served by the Ridgway U.S. Post Office 81432
- Loma in Mesa County, Colorado, is an unincorporated town served by U.S. Post Office 81524
- The City of Lone Tree in Douglas County, Colorado, is a Home Rule Municipality and a postal address served by the Littleton U.S. Post Office 80124
- The City of Longmont in Boulder County & Weld County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 80501-80504
- The City of Louisville in Boulder County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 80027-80028
- Louviers in Douglas County, Colorado, is an unincorporated town and a Census Designated Place served by U.S. Post Office 80131
- the City of Loveland in Larimer County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 80537-80539
- Lucerne in Weld County, Colorado, is an unincorporated town served by U.S. Post Office 80646
- Lycan in Baca County, Colorado, is an unincorporated community and a postal address served by the Two Buttes U.S. Post Office 81084
- The Town of Lyons in Boulder County, Colorado, is a Statutory Town served by U.S. Post Office 80540

M
- Mack in Mesa County, Colorado, is an unincorporated town served by U.S. Post Office 81525
- Maher in Montrose County, Colorado, is an unincorporated community and a postal address served by the Crawford U.S. Post Office 81415
- The Town of Manassa in Conejos County, Colorado, is a Statutory Town served by U.S. Post Office 81141
- The Town of Mancos in Montezuma County, Colorado, is a Statutory Town served by U.S. Post Office 81328
- The City of Manitou Springs in El Paso County, Colorado, is a Home Rule Municipality served by U.S. Post Office 80829
- The Town of Manzanola in Otero County, Colorado, is a Statutory Town served by U.S. Post Office 81058
- The Town of Marble in Gunnison County, Colorado, is a Statutory Town and a postal address served by the Carbondale U.S. Post Office 81623
- Marvel in La Plata County, Colorado, is an unincorporated town served by U.S. Post Office 81329
- Masonville in Larimer County, Colorado, is an unincorporated town served by U.S. Post Office 80541
- Matheson in Elbert County, Colorado, is an unincorporated town served by U.S. Post Office 80830
- Maybell in Moffat County, Colorado, is an unincorporated town served by U.S. Post Office 81640
- McClave in Bent County, Colorado, is an unincorporated town served by U.S. Post Office 81057
- McCoy in Eagle County, Colorado, is an unincorporated town served by U.S. Post Office 80463
- The Town of Mead in Weld County, Colorado, is a Statutory Town served by U.S. Post Office 80542
- The Town of Meeker in Rio Blanco County, Colorado, is a Statutory Town served by U.S. Post Office 81641
- Meredith in Pitkin County, Colorado, is an unincorporated town served by U.S. Post Office 81642
- Meridian in Douglas County, Colorado, is an unincorporated community and a Census Designated Place served by the Englewood U.S. Post Offices 80112
- Town of Merino in Logan County, Colorado, is a Statutory Town served by U.S. Post Office 80741
- Mesa in Mesa County, Colorado, is an unincorporated town served by U.S. Post Office 81643
- Mesa Verde National Park in Montezuma County, Colorado, is served by U.S. Post Office 81330
- Mesita in Costilla County, Colorado, is an unincorporated community and a postal address served by the San Luis U.S. Post Office 81152
- The Town of Milliken in Weld County, Colorado, is a Statutory Town served by U.S. Post Office 80543
- The Town of Minturn in Eagle County, Colorado, is a Home Rule Municipality served by U.S. Post Office 81645
- Model in Las Animas County, Colorado, is an unincorporated town served by U.S. Post Office 81059
- The Town of Moffat in Saguache County, Colorado, is a Statutory Town served by U.S. Post Office 81143
- Molina in Mesa County, Colorado, is an unincorporated town served by U.S. Post Office 81646
- Monarch in Chaffee County, Colorado, is an unincorporated community and a postal address 81227
- The City of Monte Vista in Rio Grande County, Colorado, is a Home Rule Municipality served by U.S. Post Office 81144
- The Town of Montezuma in Summit County, Colorado, is a Statutory Town and a postal address served by the Dillon U.S. Post Office 80435
- The City of Montrose in Montrose County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 81401-81402
- The Town of Monument in El Paso County, Colorado, is a Statutory Town served by U.S. Post Office 80132
- The Town of Morrison in Jefferson County, Colorado, is a Home Rule Municipality served by U.S. Post Office 80465
- Mosca in Alamosa County, Colorado, is an unincorporated town served by U.S. Post Office 81146
- The Town of Mount Crested Butte in Gunnison County, Colorado, is a Home Rule Municipality served by the Crested Butte U.S. Post Office 81225
- The Town of Mountain View in Jefferson County, Colorado, is a Home Rule Municipality and a postal address served by the Denver U.S. Post Office 80212
- The Town of Mountain Village in San Miguel County, Colorado, is a Home Rule Municipality and a postal address served by the Telluride U.S. Post Office 81435

N
- Nathrop in Chaffee County, Colorado, is an unincorporated town served by U.S. Post Office 81236
- The Town of Naturita in Montrose County, Colorado, is a Statutory Town served by U.S. Post Office 81422
- The Town of Nederland in Boulder County, Colorado, is a Statutory Town served by U.S. Post Office 80466
- The Town of New Castle in Garfield County, Colorado, is a Home Rule Municipality served by U.S. Post Office 81647
- New Raymer in Weld County, Colorado, is the U.S. Post Office 80742 serving the Town of Raymer and environs.
- Ninaview in Bent County, Colorado, is an unincorporated community and a postal address served by the Las Animas U.S. Post Office 81054
- Niwot in Boulder County, Colorado, is an unincorporated town and a Census Designated Place served by U.S. Post Office 80544
- North Avondale in Pueblo County, Colorado, is an unincorporated community and a postal address served by the Avondale U.S. Post Office 81022
- North Washington in Adams County, Colorado, is an unincorporated community and a Census Designated Place served by the Denver U.S. Post Office 80216
- The City of Northglenn in Adams County & Weld County, Colorado, is a Home Rule Municipality and a postal address served by the Denver U.S. Post Offices 80233-80234 & 80241 & 80260
- The Town of Norwood in San Miguel County, Colorado, is a Statutory Town served by U.S. Post Office 81423
- The Town of Nucla in Montrose County, Colorado, is a Statutory Town served by U.S. Post Office 81424
- The Town of Nunn in Weld County, Colorado, is a Statutory Town served by U.S. Post Office 80648

O
- The Town of Oak Creek in Routt County, Colorado, is a Statutory Town served by U.S. Post Office 80467
- Ohio City in Gunnison County, Colorado, is an unincorporated town served by U.S. Post Office 81237
- The Town of Olathe in Montrose County, Colorado, is a Statutory Town served by U.S. Post Office 81425
- The Town of Olney Springs in Crowley County, Colorado, is a Statutory Town served by U.S. Post Office 81062
- The Town of Ophir in San Miguel County, Colorado, is a Home Rule Municipality served by U.S. Post Office 81426
- Orchard in Morgan County, Colorado, is an unincorporated town served by U.S. Post Office 80649
- The Town of Orchard City in Delta County, Colorado, is a Statutory Town and a postal address served by the Austin U.S. Post Office 81410
- Orchard Mesa in Mesa County, Colorado, is an unincorporated community and a Census Designated Place served by the Grand Junction U.S. Post Office 81503
- The Town of Ordway in Crowley County, Colorado, is a Statutory Town served by U.S. Post Office 81063
- The Town of Otis in Washington County, Colorado, is a Statutory Town served by U.S. Post Office 80743
- The City of Ouray in Ouray County, Colorado, is a Statutory City served by U.S. Post Office 81427
- The Town of Ovid in Sedgwick County, Colorado, is a Statutory Town served by U.S. Post Office 80744

P
- Padroni in Logan County, Colorado, is an unincorporated town and a Census Designated Place served by U.S. Post Office 80745
- The Town of Pagosa Springs in Archuleta County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 81147 & 81157
- The Town of Palisade in Mesa County, Colorado, is a Statutory Town served by U.S. Post Office 81526
- The Town of Palmer Lake in El Paso County, Colorado, is a Statutory Town served by U.S. Post Office 80133
- The Town of Paoli in Phillips County, Colorado, is a Statutory Town served by U.S. Post Office 80746
- The Town of Paonia in Delta County, Colorado, is a Statutory Town served by U.S. Post Office 81428
- The Town of Parachute in Garfield County, Colorado, is a Statutory Town served by U.S. Post Office 81635
- Paradox in Montrose County, Colorado, is an unincorporated town served by U.S. Post Office 81429
- The Town of Parker in Douglas County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 80134 & 80138
- Parlin in Gunnison County, Colorado, is an unincorporated town served by U.S. Post Office 81239
- Parshall in Grand County, Colorado, is an unincorporated town served by U.S. Post Office 80468
- The Town of Peetz in Logan County, Colorado, is a Statutory Town served by U.S. Post Office 80747
- Penrose in Fremont County, Colorado, is an unincorporated town and a Census Designated Place served by U.S. Post Office 81240
- Perry Park in Douglas County, Colorado, is an unincorporated community and a Census Designated Place served by the Larkspur U.S. Post Office 80118
- Peterson AFB in El Paso County, Colorado, is a U.S. Air Force base and a postal address served by the Colorado Springs U.S. Post Office 80914
- Peyton in El Paso County, Colorado, is an unincorporated town served by U.S. Post Office 80831
- Phippsburg in Routt County, Colorado, is an unincorporated town served by U.S. Post Office 80469
- The Town of Pierce in Weld County, Colorado, is a Statutory Town served by U.S. Post Office 80650
- Pine in Jefferson County, Colorado, is an unincorporated town served by U.S. Post Office 80470
- Pinecliffe in Boulder County, Colorado, is an unincorporated town served by U.S. Post Office 80471
- The Town of Pitkin in Gunnison County, Colorado, is a Statutory Town served by U.S. Post Office 81241
- Placerville in San Miguel County, Colorado, is an unincorporated town served by U.S. Post Office 81430
- The Town of Platteville in Weld County, Colorado, is a Statutory Town served by U.S. Post Office 80651
- Pleasant View in Montezuma County, Colorado, is an unincorporated town served by U.S. Post Office 81331
- The Town of Poncha Springs in Chaffee County, Colorado, is a Statutory Town served by U.S. Post Office 81242
- Ponderosa Park in Elbert County, Colorado, is an unincorporated community and a Census Designated Place served by the Elizabeth U.S. Post Office 80107
- Powderhorn in Gunnison County, Colorado, is an unincorporated town served by U.S. Post Office 81243
- The Town of Pritchett in Baca County, Colorado, is a Statutory Town served by U.S. Post Office 81064
- The City of Pueblo in Pueblo County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 81001-81012
- Pueblo West in Pueblo County, Colorado, is an unincorporated community and a Census Designated Place and a postal address served by the Pueblo U.S. Post Offices 81007

R
- The Town of Ramah in El Paso County, Colorado, is a Statutory Town served by U.S. Post Office 80832
- Rand in Jackson County, Colorado, is an unincorporated town served by U.S. Post Office 80473
- The Town of Rangely in Rio Blanco County, Colorado, is a Statutory Town served by U.S. Post Office 81648
- The Town of Raymer in Weld County, Colorado, is a Statutory Town served by the New Raymer U.S. Post Office 80742
- The Town of Red Cliff in Eagle County, Colorado, is a Statutory Town served by U.S. Post Office 81649
- Red Feather Lakes in Larimer County, Colorado, is an unincorporated town and a Census Designated Place served by U.S. Post Office 80545
- Redlands in Mesa County, Colorado, is an unincorporated community and a Census Designated Place served by the Grand Junction U.S. Post Office 81503
- Redstone in Pitkin County, Colorado, is an unincorporated community and a postal address served by the Carbondale U.S. Post Office 81623
- Redvale in Montrose County, Colorado, is an unincorporated town served by U.S. Post Office 81431
- The Town of Rico in Dolores County, Colorado, is a Home Rule Municipality served by U.S. Post Office 81332
- The Town of Ridgway in Ouray County, Colorado, is a Home Rule Municipality served by U.S. Post Office 81432
- The City of Rifle in Garfield County, Colorado, is a Home Rule Municipality served by U.S. Post Office 81650
- The Town of Rockvale in Fremont County, Colorado, is a Statutory Town served by U.S. Post Office 81244
- The City of Rocky Ford in Otero County, Colorado, is a Statutory City served by U.S. Post Office 81067
- Roggen in Weld County, Colorado, is an unincorporated town served by U.S. Post Office 80652
- Rollinsville in Gilpin County, Colorado, is an unincorporated town served by U.S. Post Office 80474
- The Town of Romeo in Conejos County, Colorado, is a Statutory Town served by U.S. Post Office 81148
- Roxborough Park in Douglas County, Colorado, is an unincorporated community and a Census Designated Place served by the Littleton U.S. Post Office 80125
- Rush in El Paso County, Colorado, is an unincorporated town served by U.S. Post Office 80833
- The Town of Rye in Pueblo County, Colorado, is a Statutory Town served by U.S. Post Office 81069

S
- The Town of Saguache[5] in Saguache County, Colorado, is a Statutory Town served by U.S. Post Office 81149
- The City of Salida in Chaffee County, Colorado, is a Statutory City served by U.S. Post Office 81201
- Salt Creek in Pueblo County, Colorado, is an unincorporated community and a Census Designated Place served by the Pueblo U.S. Post Offices 81006
- San Acacio in Conejos County, Colorado, is an unincorporated community and a postal address served by the Sanford U.S. Post Office 81151
- The Town of San Luis in Costilla County, Colorado, is a Statutory Town served by U.S. Post Office 81152
- San Pablo in Costilla County, Colorado, is an unincorporated town served by U.S. Post Office 81153
- The Town of Sanford in Conejos County, Colorado, is a Statutory Town served by U.S. Post Office 81151
- Sangre de Cristo Ranches in Costilla County, Colorado, is an unincorporated community and a postal address served by the Fort Garland U.S. Post Office 81133
- Sapinero in Gunnison County, Colorado, is an unincorporated community and a postal address served by the Gunnison U.S. Post Office 81247
- Sargents in Saguache County, Colorado, is an unincorporated town served by U.S. Post Office 81248
- The Town of Sawpit in San Miguel County, Colorado, is a Statutory Town served by the Placerville U.S. Post Office 81430
- Schriever AFB in El Paso County, Colorado, is a U.S. Air Force base and a postal address served by the Colorado Springs U.S. Post Office 80912
- Security-Widefield in El Paso County, Colorado, is a Census Designated Place served by the Colorado Springs U.S. Post Offices 80911 & 80925 & 80928-80931
- Sedalia in Douglas County, Colorado, is an unincorporated town and a Census Designated Place served by U.S. Post Office 80135
- The Town of Sedgwick in Sedgwick County, Colorado, is a Statutory Town served by U.S. Post Office 80749
- The Town of Seibert in Kit Carson County, Colorado, is a Statutory Town served by U.S. Post Office 80834
- The Town of Severance in Weld County, Colorado, is a Statutory Town served by U.S. Post Office 80546
- Shawnee in Park County, Colorado, is an unincorporated town served by U.S. Post Office 80475
- The City of Sheridan in Arapahoe County, Colorado, is a Home Rule Municipality and a postal address served by the Englewood U.S. Post Office 80110
- The Town of Sheridan Lake in Kiowa County, Colorado, is a Statutory Town served by U.S. Post Office 81071
- Sherrelwood in Adams County, Colorado, is an unincorporated community and a Census Designated Place served by the Denver U.S. Post Office 80221
- The Town of Silt in Garfield County, Colorado, is a Statutory Town served by U.S. Post Office 81652
- The Town of Silver Cliff in Custer County, Colorado, is a Statutory Town and a postal address served by the Westcliffe U.S. Post Office 81252
- The Town of Silver Plume in Clear Creek County, Colorado, is a Statutory Town served by U.S. Post Office 80476
- The Town of Silverthorne in Summit County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 80497-80498
- The Town of Silverton in San Juan County, Colorado, is a Statutory Town served by U.S. Post Office 81433
- The Town of Simla in Elbert County, Colorado, is a Statutory Town served by U.S. Post Office 80835
- Slater in Moffat County, Colorado, is an unincorporated town served by U.S. Post Office 81653
- Slick Rock in San Miguel County, Colorado, is an unincorporated community and a postal address served by the Egnar U.S. Post Office 81325
- Snowmass in Pitkin County, Colorado, is an unincorporated town served by U.S. Post Office 81654
- The Town of Snowmass Village in Pitkin County, Colorado, is a Home Rule Municipality served by U.S. Post Office 81615
- Snyder in Morgan County, Colorado, is an unincorporated town served by U.S. Post Office 80750
- Somerset in Gunnison County, Colorado, is an unincorporated town served by U.S. Post Office 81434
- Sopris in Las Animas County, Colorado, is an unincorporated community and a postal address served by the Trinidad U.S. Post Office 81082
- The Town of South Fork in Rio Grande County, Colorado, is a Statutory Town served by U.S. Post Office 81154
- The Town of South Park in Park County, Colorado, is a fictional town associated with Fairplay, Colorado
- Southglenn in Arapahoe County, Colorado, is a defunct Census Designated Place that is now part of the City of Centennial
- The Town of Springfield in Baca County, Colorado, is a Statutory Town served by U.S. Post Office 81073
- St. Mary's in Clear Creek County, Colorado, is an unincorporated community and a Census Designated Place served by the Idaho Springs U.S. Post Office 80452
- The Town of Starkville in Las Animas County, Colorado, is a Statutory Town and a postal address served by the Trinidad U.S. Post Office 81082
- The City of Steamboat Springs in Routt County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 80477 & 80487-80488
- The City of Sterling in Logan County, Colorado, is a Home Rule Municipality served by U.S. Post Office 80751
- Stonegate in Douglas County, Colorado, is an unincorporated community and a Census Designated Place served by the Parker U.S. Post Office 80134
- Stoneham in Weld County, Colorado, is an unincorporated town served by U.S. Post Office 80754
- Strasburg in Adams County & Arapahoe County, Colorado, is an unincorporated town and a Census Designated Place served by U.S. Post Office 80136
- Stratmoor in El Paso County, Colorado, is an unincorporated community and a Census Designated Place served by the Colorado Springs U.S. Post Office 80906
- The Town of Stratton in Kit Carson County, Colorado, is a Statutory Town served by U.S. Post Office 80836
- The Town of Sugar City in Crowley County, Colorado, is a Statutory Town served by U.S. Post Office 81076
- The Town of Superior in Boulder County & Jefferson County, Colorado, is a Statutory Town and a postal address served by the Louisville U.S. Post Offices 80027
- The Town of Swink in Otero County, Colorado, is a Statutory Town served by U.S. Post Office 81077

T
- Tabernash in Grand County, Colorado, is an unincorporated town and a Census Designated Place served by U.S. Post Office 80478
- The Town of Telluride in San Miguel County, Colorado, is a Home Rule Municipality served by U.S. Post Office 81435
- Thatcher in Las Animas County, Colorado, is an unincorporated community and a postal address served by the Model U.S. Post Office 81059
- The Pinery in Douglas County, Colorado, is an unincorporated community and a Census Designated Place served by the Parker U.S. Post Office 80134
- The City of Thornton in Adams County & Weld County, Colorado, is a Home Rule Municipality and a postal address served by the Denver U.S. Post Offices 80221 & 80229 & 80233 & 80241 & 80260 and Brighton U.S. Post Office 80602
- The Town of Timnath in Larimer County, Colorado, is a Statutory Town served by U.S. Post Office 80547
- Timpas in Otero County, Colorado, is an unincorporated community and a postal address served by the La Junta U.S. Post Office 81050
- Todd Creek in Adams County, Colorado, is an unincorporated community and a Census Designated Place served by the Brighton U.S. Post Office 80601
- Toponas in Routt County, Colorado, is an unincorporated town served by U.S. Post Office 80479
- Towaoc in Montezuma County, Colorado, is an unincorporated town and a Census Designated Place served by U.S. Post Office 81334
- Towner in Kiowa County, Colorado, is an unincorporated community and a postal address served by the Sheridan Lake U.S. Post Office 81071
- Trinchera in Las Animas County, Colorado, is an unincorporated town served by U.S. Post Office 81081
- The City of Trinidad in Las Animas County, Colorado, is a Home Rule Municipality served by U.S. Post Office 81082
- Twin Lakes in Adams County, Colorado, is an unincorporated community and a Census Designated Place served by the Denver U.S. Post Office 80221
- Twin Lakes in Lake County, Colorado, is an unincorporated town served by U.S. Post Office 81251
- The Town of Two Buttes in Baca County, Colorado, is a Statutory Town served by U.S. Post Office 81084
- Tyrone in Las Animas County, Colorado, is an unincorporated community and a postal address served by the Model U.S. Post Office 81059

U
- The United States Air Force Academy in El Paso County, Colorado includes U.S. Post Offices 80840-80841
- Utleyville in Baca County, Colorado, is an unincorporated community and a postal address served by the Pritchett U.S. Post Office 81064

V
- The Town of Vail in Eagle County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 81657-81658
- Vernon in Yuma County, Colorado, is an unincorporated town served by U.S. Post Office 80755
- The City of Victor in Teller County, Colorado, is a Statutory City served by U.S. Post Office 80860
- The Town of Vilas in Baca County, Colorado, is a Statutory Town served by U.S. Post Office 81087
- Villa Grove in Saguache County, Colorado, is an unincorporated town served by U.S. Post Office 81155
- Villegreen in Las Animas County, Colorado, is an unincorporated community and a postal address served by the Kim U.S. Post Office 81049
- Virginia Dale in Larimer County, Colorado, is an unincorporated community and a postal address served by the Livermore U.S. Post Office 80536
- The Town of Vona in Kit Carson County, Colorado, is a Statutory Town served by U.S. Post Office 80861

W
- The Town of Walden in Jackson County, Colorado, is a Statutory Town served by U.S. Post Office 80480
- The City of Walsenburg in Huerfano County, Colorado, is a Statutory City served by U.S. Post Office 81089
- The Town of Walsh in Baca County, Colorado, is a Statutory Town served by U.S. Post Office 81090
- The Town of Ward in Boulder County, Colorado, is a Home Rule Municipality served by U.S. Post Office 80481
- Watkins in Adams County & Arapahoe County, Colorado, is an unincorporated town served by U.S. Post Office 80137
- Wattenburg in Weld County, Colorado, is an unincorporated community and a postal address served by the Fort Lupton U.S. Post Office 80621
- Welby in Adams County, Colorado, is an unincorporated community and a Census Designated Place served by the Denver U.S. Post Office 80229
- Weldona in Morgan County, Colorado, is an unincorporated town served by U.S. Post Office 80653
- The Town of Wellington in Larimer County, Colorado, is a Statutory Town served by U.S. Post Office 80549
- West Pleasant View in Jefferson County, Colorado, is an unincorporated community and a Census Designated Place served by the Golden U.S. Post Office 80401
- The Town of Westcliffe in Custer County, Colorado, is a Statutory Town served by U.S. Post Office 81252
- Westcreek in Douglas County, Colorado, is an unincorporated community and a Census Designated Place served by the Woodland Park U.S. Post Offices 80863
- The City of Westminster in Adams County & Jefferson County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 80030-80031 & 80035-80036
- Weston in Las Animas County, Colorado, is an unincorporated town served by U.S. Post Office 81091
- Wetmore in Custer County, Colorado, is an unincorporated town served by U.S. Post Office 81253
- The City of Wheat Ridge in Jefferson County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 80033-80034
- Whitewater in Mesa County, Colorado, is an unincorporated town served by U.S. Post Office 81527
- The Town of Wiggins in Morgan County, Colorado, is a Statutory Town served by U.S. Post Office 80654
- Wild Horse in Cheyenne County, Colorado, is an unincorporated town served by U.S. Post Office 80862
- The Town of Wiley in Prowers County, Colorado, is a Statutory Town served by U.S. Post Office 81092
- Willard in Logan County, Colorado, is an unincorporated community and a postal address served by the Merino U.S. Post Office 80741
- The Town of Williamsburg in Fremont County, Colorado, is a Statutory Town served by the Florence U.S. Post Offices 81226
- The Town of Windsor in Weld County & Larimer County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 80550-80551
- The Town of Winter Park in Grand County, Colorado, is a Home Rule Municipality served by U.S. Post Office 80482
- Wolcott in Eagle County, Colorado, is an unincorporated town served by U.S. Post Office 81655
- The City of Woodland Park in Teller County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 80863 & 80866
- Woodmoor in El Paso County, Colorado, is an unincorporated community and a Census Designated Place served by the Monument U.S. Post Office 80132
- Woodrow in Washington County, Colorado, is an unincorporated town served by U.S. Post Office 80757
- Woody Creek in Pitkin County, Colorado, is an unincorporated town served by U.S. Post Office 81656
- The City of Wray in Yuma County, Colorado, is a Home Rule Municipality served by U.S. Post Office 80758

Y
- The Town of Yampa in Routt County, Colorado, is a Statutory Town served by U.S. Post Office 80483
- Yellow Jacket in Montezuma County, Colorado, is an unincorporated town served by U.S. Post Office 81335
- Yoder in El Paso County, Colorado, is an unincorporated town served by U.S. Post Office 80864
- The City of Yuma in Yuma County, Colorado, is a Home Rule Municipality served by U.S. Post Office 80759