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* Acres Green in Douglas County, Colorado, is an unincorporated community and a Census Designated Place served by the Littleton U.S. Post Office 80124
* Agate in Elbert County, Colorado, is an unincorporated town served by U.S. Post Office 80101
* Air Force Academy in El Paso County, Colorado, is a Census Designated Place served by the United States Air Force Academy U.S. Post Offices 80840-80841
* Allenspark in Boulder County, Colorado, is an unincorporated town and a Census Designated Place served by U.S. Post Office 80510
* The Town of Alma in Park County, Colorado, is a Statutory Town served by U.S. Post Office 80420
* Applewood in Jefferson County, Colorado, is an unincorporated community and a Census Designated Place served by the Golden U.S. Post Office 80401
* The City of Arvada in Jefferson County & Adams County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 80001-80007
* Aspen Park in Jefferson County, Colorado, is an unincorporated community and a Census Designated Place served by the Conifer U.S. Post Office 80433
* The City of Aurora in Arapahoe County & Adams County & Douglas County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 80010-80019 & 80040-80047
* 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 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
* The City of Brighton in Adams County & Weld County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 80601-80603
* The City and County of Broomfield, Colorado, is a Consolidated City and County served by U.S. Post Offices 80020-80021 & 80038
* Byers in Arapahoe County, Colorado, is an unincorporated town and a Census Designated Place served by U.S. Post Office 80103
* Carriage Club in Douglas County, Colorado, is an unincorporated community and a Census Designated Place served by the Littleton U.S. Post Office 80124
* 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 a Statutory City served by the Castle Rock U.S. Post Office 80108
* Castle Pines Village in Douglas County, Colorado, is an unincorporated community 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 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
* 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
* 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
* Conifer in Jefferson County, Colorado, is an unincorporated town served by U.S. Post Office 80433
* Cottonwood in Douglas County, Colorado, is an unincorporated community and a Census Designated Place served by the Parker U.S. Post Office 80134
* 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 City and County of Denver, Colorado, is a Consolidated City and County served by U.S. Post Offices 80201-80299
* Derby in Adams County, Colorado, is an unincorporated community and a Census Designated Place served by the Commerce City U.S. Post Offices 80022
* Dupont in Adams County, Colorado, is an unincorporated town served by U.S. Post Office 80024
* 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 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
* 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 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
* Evergreen in Jefferson County, Colorado, is an unincorporated community and a Census Designated Place served by U.S. Post Offices 80437 & 80439
* 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 City of Fort Collins in Larimer County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 80521-80528 & 80553
* The City of Fort Lupton in Weld County, Colorado, is a Statutory City served by U.S. Post Office 80621
* The City of Fort Morgan in Morgan County, Colorado, is a Home Rule Municipality served by U.S. Post Office 80701
* 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
* Franktown in Douglas County, Colorado, is an unincorporated town and a Census Designated Place served by U.S. Post Office 80116
* The Town of Frederick in Weld County, Colorado, is a Statutory Town served by U.S. Post Office 80530
* 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
* 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 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
* 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
* 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
* 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
* The City of Greeley in Weld County, Colorado, is a Home Rule Municipality served by U.S. Post Offices 80631-80639
* 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
* Gunbarrel in Boulder County, Colorado, is an unincorporated community and a Census Designated Place served by the Boulder U.S. Post Office 80301 * Henderson in Adams County, Colorado, is an unincorporated town served by U.S. Post Office 80640
* Heritage Hills in Douglas County, Colorado, is an unincorporated community and a Census Designated Place served by the Littleton U.S. Post Office 80124
* 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 Hudson in Weld County, Colorado, is a Statutory Town served by U.S. Post Office 80642
* Hygiene in Boulder County, Colorado, is an unincorporated town served by U.S. Post Office 80533
* Idledale in Jefferson County, Colorado, is an unincorporated town served by U.S. Post Office 80453
* Indian Hills in Jefferson County, Colorado, is an unincorporated town and a Census Designated Place served by U.S. Post Office 80454
* The Town of Jamestown in Boulder County, Colorado, is a Statutory Town served by U.S. Post Office 80455
* 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 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
* Kittredge in Jefferson County, Colorado, is an unincorporated town and a Census Designated Place served by U.S. Post Office 80457
* The Town of La Salle in Weld County, Colorado, is a Statutory Town served by U.S. Post Office 80645
* The City of Lafayette in Boulder County, Colorado, is a Home Rule Municipality served by U.S. Post Office 80026
* 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 Town of Larkspur in Douglas County, Colorado, is a Home Rule Municipality served by U.S. Post Office 80118
* 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
* 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 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
* The Town of Lyons in Boulder County, Colorado, is a Statutory Town served by U.S. Post Office 80540