The state of Colorado is currently using four area codes. Area code 303 originally covered all of Colorado when it was established in 1947. Area code 720 most recently added in 1998. Today, 303 is the most populated Area code about 2.9 million of the state’s 5 million residents.

Colorado Area Codes

303
719
720
970
Colorado Area Codes

Colorado Area Codes for the Largest Cities

  • Arvada303/720
  • Aurora303/720
  • Boulder303/720
  • Brighton303/720
  • Columbine303/720
  • Broomfield720/303
  • Castlewood720/303
  • Castle Rock720/303
  • Colorado Springs719
  • Commerce City303/720
  • Denver303/720
  • Englewood303/720
  • Fort Collins970
  • Greeley970
  • Grand Junction970
  • Highlands Ranch303/720
  • Ken Caryl720/303
  • Lakewood720/303
  • Longmont303/720
  • Lafayette720/303
  • Littleton303/720
  • Loveland303/720/970
  • Northglenn 303/720
  • Pueblo719
  • Parker303/720
  • Southglenn720/303
  • Security-widefield719
  • Thornton720/303
  • Westminster720/303
  • Wheat Ridge303/720
303 area code Timezone: Mountain
Current time:

720 is an overlay of 303

  • Altona
  • Arvada
  • Aurora
  • Applewood
  • Allenspark
  • Aspen Park
  • Acres Green
  • Aetna Estates
  • Aristocrat Ranchettes
  • Byers
  • Bennett
  • Berkley
  • Boulder
  • Bow Mar
  • Brighton
  • Bark Ranch
  • Black Hawk
  • Broomfield
  • Brick Center
  • Bonanza Mountain Estates
  • Crisman
  • Columbine
  • Centennial
  • Coal Creek
  • Castle Rock
  • Castle Pines
  • Central City
  • Cherry Creek
  • Commerce City
  • Comanche Creek
  • Columbine Valley
  • Castle Pines North
  • Cherry Hills Village
  • Derby
  • Dacono
  • Denver
  • Deer Trail
  • Dove Valley
  • Dakota Ridge
  • Downieville-Lawson-Dumont
  • Erie
  • Elbert
  • Eldora
  • Empire
  • Edgewater
  • Elizabeth
  • Englewood
  • Evergreen
  • Eldorado Springs
  • East Pleasant View
  • Foxfield
  • Fairmount
  • Firestone
  • Franktown
  • Frederick
  • Floyd Hill
  • Fort Lupton
  • Federal Heights
  • Golden
  • Genesee
  • Glendale
  • Glendale
  • Gold Hill
  • Gunbarrel
  • Georgetown
  • Greenwood Village
  • Grand View Estates
  • Hudson
  • Hidden Lake
  • Holly Hills
  • Highlands Ranch
  • Idledale
  • Inverness
  • Indian Hills
  • Idaho Springs
  • Jamestown
  • Kiowa
  • Ken Caryl
  • Kittredge
  • Keenesburg
  • Lyons
  • Leyner
  • Lakeside
  • Lakewood
  • Larkspur
  • Lochbuie
  • Longmont
  • Louviers
  • Littleton
  • Lone Tree
  • Lafayette
  • Louisville
  • Lazy Acres
  • Meridian
  • Morrison
  • Mountain View
  • Mountain Meadows
  • Niwot
  • Nederland
  • Northglenn
  • North Washington
  • Parker
  • Peoria
  • Perry Park
  • Ponderosa Park
  • Paragon Estates
  • Pine Brook Hill
  • Rollinsville
  • Roxborough Park
  • Sedalia
  • Sheridan
  • Sunshine
  • Superior
  • Stonegate
  • Strasburg
  • Sugarloaf
  • St. Mary's
  • Seven Hills
  • Sherrelwood
  • Shaw Heights
  • Silver Plume
  • St. Ann Highlands
  • Thornton
  • Todd Creek
  • Twin Lakes
  • The Pinery
  • Tall Timber
  • Upper Bear Creek
  • Valmont
  • Ward
  • Welby
  • Watkins
  • Westcreek
  • Westminster
  • Wheat Ridge
  • West Pleasant View
719 area code Timezone: Mountain
Current time:
  • Alma
  • Alpine
  • Arriba
  • Aguilar
  • Alamosa
  • Antonito
  • Avondale
  • Alamosa East
  • Air Force Academy
  • Boone
  • Blanca
  • Blende
  • Bethune
  • Bonanza
  • Brandon
  • Branson
  • Brookside
  • Burlington
  • Buena Vista
  • Black Forest
  • Beulah Valley
  • Ca
  • Campo
  • Calhan
  • Center
  • Cheraw
  • Capulin
  • Conejos
  • Crowley
  • Coaldale
  • Cokedale
  • Cotopaxi
  • Crestone
  • Coal Creek
  • Colorado City
  • Cripple Creek
  • Cheyenne Wells
  • Cimarron Hills
  • City of Creede
  • Colorado Springs
  • Cascade-Chipita Park
  • Divide
  • Del Norte
  • Eads
  • El Moro
  • Ellicott
  • Fowler
  • Flagler
  • Fairplay
  • Florence
  • Fountain
  • Florissant
  • Fort Carson
  • Fort Garland
  • Genoa
  • Guffey
  • Granada
  • Gerrard
  • Garfield
  • Gleneagle
  • Goldfield
  • Green Mountain Falls
  • Hugo
  • Hasty
  • Holly
  • Hoehne
  • Hooper
  • Howard
  • Hartman
  • Haswell
  • Jansen
  • Johnson Village
  • Kim
  • Kit Carson
  • Lynn
  • Lamar
  • Limon
  • La Veta
  • La Jara
  • La Junta
  • Leadville
  • Las Animas
  • Lincoln Park
  • Leadville North
  • La Junta Gardens
  • Moffat
  • Manassa
  • Midland
  • Monument
  • Manzanola
  • Maysville
  • Monte Vista
  • North La Junta
  • Manitou Springs
  • Ordway
  • Olney Springs
  • Peyton
  • Pueblo
  • Penrose
  • Pritchett
  • Palmer Lake
  • Pueblo West
  • Poncha Springs
  • Rye
  • Ramah
  • Romeo
  • Rockvale
  • Rocky Ford
  • Rock Creek Park
  • Simla
  • Swink
  • Salida
  • Sanford
  • Segundo
  • San Luis
  • Saguache
  • Stratton
  • Stratmoor
  • Salt Creek
  • San Acacio
  • Sugar City
  • South Fork
  • Starkville
  • Silver Cliff
  • Smeltertown
  • Springfield
  • Sheridan Lake
  • Stonewall Gap
  • Security-Widefield
  • Towner
  • Trinidad
  • Twin Lakes
  • Two Buttes
  • Vona
  • Vilas
  • Valdez
  • Victor
  • Vineland
  • Walsh
  • Wiley
  • Weston
  • Woodmoor
  • Walsenburg
  • Westcliffe
  • Williamsburg
  • Woodland Park
970 area code Timezone: Mountain
Current time:
  • Avon
  • Ault
  • Akron
  • Aspen
  • Atwood
  • Amherst
  • Arboles
  • Brush
  • Basalt
  • Bayfield
  • Berthoud
  • Blue Sky
  • Blue River
  • Breckenridge
  • Battlement Mesa
  • Craig
  • Crook
  • Chacra
  • Colona
  • Cortez
  • Clifton
  • Collbran
  • Crawford
  • Cathedral
  • Catherine
  • Cedaredge
  • Carbondale
  • Cattle Creek
  • Crested Butte
  • Copper Mountain
  • Delta
  • Dillon
  • Dolores
  • Dotsero
  • Durango
  • Dinosaur
  • De Beque
  • Dove Creek
  • Eagle
  • Eaton
  • Evans
  • Eckley
  • Edwards
  • Fleming
  • El Jebel
  • Fraser
  • Frisco
  • Fruita
  • Fulford
  • Fruitvale
  • Estes Park
  • Fort Collins
  • Fort Morgan
  • Granby
  • Grover
  • Gypsum
  • Greeley
  • Gilcrest
  • Gunnison
  • Grand Lake
  • Garden City
  • Grand Junction
  • Glenwood Springs
  • Haxtun
  • Hayden
  • Heeney
  • Holyoke
  • Hillrose
  • Hotchkiss
  • Hot Sulphur Springs
  • Iliff
  • Idalia
  • Ignacio
  • Joes
  • Johnstown
  • Julesburg
  • Jackson Lake
  • Kirk
  • Kersey
  • Keystone
  • Kremmling
  • Loma
  • Lewis
  • Laird
  • Laporte
  • La Salle
  • Loveland
  • Lake City
  • Loghill Village
  • Log Lane Village
  • Mead
  • McCoy
  • Mancos
  • Meeker
  • Merino
  • Marble
  • Maybell
  • Minturn
  • Mulford
  • Naturita
  • Milliken
  • Montrose
  • Montezuma
  • Morgan Heights
  • Mountain Village
  • Mount Crested Butte
  • Nunn
  • Nucla
  • Norrie
  • No Name
  • Norwood
  • New Castle
  • Otis
  • Ovid
  • Ouray
  • Ophir
  • Olathe
  • Orchard
  • Oak Creek
  • Orchard City
  • Orchard Mesa
  • Paoli
  • Peetz
  • Piedra
  • Paonia
  • Pierce
  • Pitkin
  • Padroni
  • Palisade
  • Parshall
  • Portland
  • Parachute
  • Phippsburg
  • Platteville
  • Pagosa Springs
  • Rico
  • Rifle
  • Raymer
  • Rangely
  • Redvale
  • Ridgway
  • Redlands
  • Redstone
  • Red Cliff
  • Red Feather Lakes
  • Silt
  • Sawpit
  • Snyder
  • Seibert
  • Sedgwick
  • Sterling
  • Severance
  • Silverton
  • Silverthorne
  • Southern Ute
  • Saddle Ridge
  • Snowmass Village
  • Steamboat Springs
  • Towaoc
  • Timnath
  • Tabernash
  • Telluride
  • Trail Side
  • Vail
  • Vernon
  • Wray
  • Walden
  • Weldona
  • Wiggins
  • Windsor
  • Wolcott
  • Wellington
  • Winter Park
  • Woody Creek
  • Yuma
  • Yampa
California Area Codes
Colorado Zip Code