Colorado Area Code

Colorado currently utilizes 5 area codes. When first established by AT&T and the Bell System in 1947, 303 covered the entire state of Colorado. The most recently added was 983 in 2022 as an overlay to 303. Today, 303 is the most populated with an estimated 2.9 million of the state's 5 million residents.

303

Timezone:Mountain

Acres Green
Aetna Estates
Allenspark
Altona
Applewood
Aristocrat Ranchettes
Arvada
Aspen Park
Aurora
Bark Ranch
Bennett
Berkley
Black Hawk
Bonanza Mountain Estates
Boulder
Bow Mar
Brick Center
Brighton
Broomfield
Byers
Castle Pines
Castle Pines North
Castle Rock
Centennial
Central City
Cherry Creek
Cherry Hills Village
Coal Creek
Columbine
Columbine Valley
Comanche Creek
Commerce City
Crisman
Dacono
Dakota Ridge
Deer Trail
Denver
Derby
Dove Valley
Downieville-Lawson-Dumont
East Pleasant View
Edgewater
Elbert
Eldora
Eldorado Springs
Elizabeth
Empire
Englewood
Erie
Evergreen
Fairmount
Federal Heights
Firestone
Floyd Hill
Fort Lupton
Foxfield
Franktown
Frederick
Genesee
Georgetown
Glendale
Glendale
Golden
Gold Hill
Grand View Estates
Greenwood Village
Gunbarrel
Hidden Lake
Highlands Ranch
Holly Hills
Hudson
Idaho Springs
Idledale
Indian Hills
Inverness
Jamestown
Keenesburg
Ken Caryl
Kiowa
Kittredge
Lafayette
Lakeside
Lakewood
Larkspur
Lazy Acres
Leyner
Littleton
Lochbuie
Lone Tree
Longmont
Louisville
Louviers
Lyons
Meridian
Morrison
Mountain Meadows
Mountain View
Nederland
Niwot
Northglenn
North Washington
Paragon Estates
Parker
Peoria
Perry Park
Pine Brook Hill
Ponderosa Park
Rollinsville
Roxborough Park
St. Ann Highlands
St. Mary's
Sedalia
Seven Hills
Shaw Heights
Sheridan
Sherrelwood
Silver Plume
Stonegate
Strasburg
Sugarloaf
Sunshine
Superior
Tall Timber
The Pinery
Thornton
Todd Creek
Twin Lakes
Upper Bear Creek
Valmont
Ward
Watkins
Welby
Westcreek
Westminster
West Pleasant View
Wheat Ridge

719

Timezone:Mountain

Aguilar
Air Force Academy
Alamosa
Alamosa East
Alma
Alpine
Antonito
Arriba
Avondale
Bethune
Beulah Valley
Black Forest
Blanca
Blende
Bonanza
Boone
Brandon
Branson
Brookside
Buena Vista
Burlington
Calhan
Campo
Ca
Capulin
Cascade-Chipita Park
Center
Cheraw
Cheyenne Wells
Cimarron Hills
City of Creede
Coal Creek
Coaldale
Cokedale
Colorado City
Colorado Springs
Conejos
Cotopaxi
Crestone
Cripple Creek
Crowley
Del Norte
Divide
Eads
Ellicott
El Moro
Fairplay
Flagler
Florence
Florissant
Fort Carson
Fort Garland
Fountain
Fowler
Garfield
Genoa
Gerrard
Gleneagle
Goldfield
Granada
Green Mountain Falls
Guffey
Hartman
Hasty
Haswell
Hoehne
Holly
Hooper
Howard
Hugo
Jansen
Johnson Village
Kim
Kit Carson
La Jara
La Junta
La Junta Gardens
Lamar
Las Animas
La Veta
Leadville
Leadville North
Limon
Lincoln Park
Lynn
Manassa
Manitou Springs
Manzanola
Maysville
Midland
Moffat
Monte Vista
Monument
North La Junta
Olney Springs
Ordway
Palmer Lake
Penrose
Peyton
Poncha Springs
Pritchett
Pueblo
Pueblo West
Ramah
Rock Creek Park
Rockvale
Rocky Ford
Romeo
Rye
Saguache
Salida
Salt Creek
San Acacio
Sanford
San Luis
Security-Widefield
Segundo
Sheridan Lake
Silver Cliff
Simla
Smeltertown
South Fork
Springfield
Starkville
Stonewall Gap
Stratmoor
Stratton
Sugar City
Swink
Towner
Trinidad
Twin Lakes
Two Buttes
Valdez
Victor
Vilas
Vineland
Vona
Walsenburg
Walsh
Westcliffe
Weston
Wiley
Williamsburg
Woodland Park
Woodmoor

720

Timezone:Mountain

720 is an overlay for area code 303.

970

Timezone:Mountain

Akron
Amherst
Arboles
Aspen
Atwood
Ault
Avon
Basalt
Battlement Mesa
Bayfield
Berthoud
Blue River
Blue Sky
Breckenridge
Brush
Carbondale
Cathedral
Catherine
Cattle Creek
Cedaredge
Chacra
Clifton
Collbran
Colona
Copper Mountain
Cortez
Craig
Crawford
Crested Butte
Crook
De Beque
Delta
Dillon
Dinosaur
Dolores
Dotsero
Dove Creek
Durango
Eagle
Eaton
Eckley
Edwards
El Jebel
Estes Park
Evans
Fleming
Fort Collins
Fort Morgan
Fraser
Frisco
Fruita
Fruitvale
Fulford
Garden City
Gilcrest
Glenwood Springs
Granby
Grand Junction
Grand Lake
Greeley
Grover
Gunnison
Gypsum
Haxtun
Hayden
Heeney
Hillrose
Holyoke
Hotchkiss
Hot Sulphur Springs
Idalia
Ignacio
Iliff
Jackson Lake
Joes
Johnstown
Julesburg
Kersey
Keystone
Kirk
Kremmling
Laird
Lake City
Laporte
La Salle
Lewis
Loghill Village
Log Lane Village
Loma
Loveland
McCoy
Mancos
Marble
Maybell
Mead
Meeker
Merino
Milliken
Minturn
Montezuma
Montrose
Morgan Heights
Mountain Village
Mount Crested Butte
Mulford
Naturita
New Castle
No Name
Norrie
Norwood
Nucla
Nunn
Oak Creek
Olathe
Ophir
Orchard
Orchard City
Orchard Mesa
Otis
Ouray
Ovid
Padroni
Pagosa Springs
Palisade
Paoli
Paonia
Parachute
Parshall
Peetz
Phippsburg
Piedra
Pierce
Pitkin
Platteville
Portland
Rangely
Raymer (New Raymer)
Red Cliff
Red Feather Lakes
Redlands
Redstone
Redvale
Rico
Ridgway
Rifle
Saddle Ridge
Sawpit
Sedgwick
Seibert
Severance
Silt
Silverthorne
Silverton
Snowmass Village
Snyder
Southern Ute
Steamboat Springs
Sterling
Tabernash
Telluride
Timnath
Towaoc
Trail Side
Vail
Vernon
Walden
Weldona
Wellington
Wiggins
Windsor
Winter Park
Wolcott
Woody Creek
Wray
Yampa
Yuma

983

Timezone:Mountain

983 is an overlay for area code 303.