Colorado area codes: all 6 codes and where they ring

All Colorado area codes

Drawn from the NANPA file dated 11/01/2026: the area code report, the rate-centre report plus exhaust projections. We are not an official NANPA site.

How Colorado gained its area codes

For 41 years 303 covered Colorado by itself, until 719 opened in 1988.

1. 1947: 303 was one of the original area codes of 1947, covering Allenspark-lyons, Bennett and Byers.
2. 1988: 719 was created when 303 was divided, covering Agate, Aguilar and Alamosa.
3. 1995: 970 was created when 303 was divided, covering Akron, Allison and Anton.
4. In 1998, 720 was introduced as an overlay for 303, covering the same area.
5. In 2022, 983 was introduced as an overlay for 303, covering the same area.
6. In 2025, 748 was introduced as an overlay for 970, covering the same area.

Making calls in Colorado

For 303, 719, 970, 720, 983 and 748, a local number needs full 10-digit dialling. A long-distance call requires 1 + 10-digit dialling.

Colorado area code coverage by place

303, 720 and 983 share one overlay area: 13 rate centres

Strasburg, Roggen, Longmont, Keenesburg, Hudson, Georgetown, Fort Lupton, Denver, Deer Trail, Deckers, Byers, Allenspark-lyons, Bennett.

Rate centres under 719: 75

Agate, Aguilar, Alamosa, Weston, Westcliffe, West Manter, West Kanorado, Walsh, Walsenburg, Two Buttes, Trinidad, Towner, Stratton, Springfield, Simla, Sheridan Lake, San Luis, Salida, Saguache, Rye, Rush, Rocky Ford, Pueblo, Peyton, Ordway, Mosca, Monte Vista, Manzanola, Manassa, Limon, Leadville, Las Animas, Lamar, Lake George, La Veta, La Junta, La Jara, Kit Carson, Kim, Kenton, Karval, Hugo, Howard, Holly, Haswell, Hartsel, Hartman, Genoa, Gardner, Fowler, Florence, Flagler, Fairplay, El Paso, Eads, Del Norte, Cripple Creek, Crestone, Creede, Colorado Springs, Colorado City, Cheyenne Wells, Cheraw, Center, Canon City, Campo, Calhan, Burlington, Buena Vista, Bristol Granada, Branson, Blanca, Beulah, Arriba and Antonito.

One overlay area for 970 and 748: 120 rate centres

Akron, Allison, Anton, Yuma, Yampa, Wray, Woodrow, Windsor, Willard, Wiggins, West Venango, Weldona, Walden, Vona Seibert, Vail, Telluride, Stoneham, Sterling, Steamboat Springs, South Sidney, South Laramie, South Cheyenne, South Big Springs, South Baggs, Somerset, Silverton, Silt, Rifle, Ridgway, Rico, Red Feather Lakes, Rangely, Pleasant View, Platteville, Peetz, Paradox, Parachute, Paonia, Palisade, Pagosa Springs, Ouray, Otis, Olathe, Oak Creek, Nunn, Nucla, Norwood, New Raymer, New Castle, Naturita, Montrose, Mesa, Meeker, Mead, Mccoy, Maybell, Marvel, Mancos, Loveland, Lodore, Lake City, La Salle, Kremmling, Kirk, Julesburg, Johnstown-milliken, Joes, Ignacio, Idalia, Hotchkiss, Hot Sulphur Springs, Holyoke, Hillrose, Hayden, Haxtun, Gypsum, Gunnison, Grover, Greeley, Grand Lake, Grand Junction, Granby, Glenwood Springs, Gilcrest, Gateway, Fruita, Fraser, Fort Morgan, Fort Collins, Fleming, Estes Park, Edwards, Eckley, Eckert, Eaton, Eagle, Durango, Dove Creek, Dolores, Dinosaur, Dillon, Delta, De Beque, Crook, Crested Butte, Crawford, Craig, Cortez, Cope, Collbran, Cimarron, Cedaredge, Carbondale, Brush, Briggsdale, Breckenridge, Berthoud, Bayfield, Basalt and Aspen.

Will another area code be added in Colorado?

Not for years: NANPA expects 719 to run out first, in 2035.

Area codes in the states bordering Colorado

• Arizona: 602, 520, 480, 623 and 928
• Kansas: 316, 913, 785 and 620
• Nebraska: 402, 308 and 531
• New Mexico: 505 and 575
• Oklahoma: 405, 918, 580, 539 and 572
• Utah: 801, 435 and 385
• Wyoming: 307

Cities in Colorado

Area codes for Denver.

Questions about Colorado area codes