Colorado, United States

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Basic Information About Colorado

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Capital : DenverPopulation of : 4,550,688
NDD: 1Current time: -05:00..-11:00
Colorado area codes: 303, 719, 720, 970Coordinates: 39.5501° N, 105.7821° W
Exit code : 011Area: 269,596 km²
Country code of United States: 1Official GOV. web site: colorado.gov

Colorado Area Codes Pieces of Information

Colorado has three area codes: 303, 719, and 720. Area Code 970 is also assigned to Colorado, but it is not currently in use. The 303 area code is the oldest one in use in the state of Colorado. It was created on October 1st, 1947. The 970 area code was assigned to Colorado in 1996, but it has never been put into use. There were plans to assign 970 to Grand Junction, but they were canceled due to Number Pooling. Under Number Pooling, certain Area Codes are no longer used for geographic areas but are instead used to assign telephone numbers to cellular providers and other service providers.


As a result of Number Pooling, the 303, 719, and 720 Area Codes are now all being used in Colorado. Area Code 720 was created on November 20th, 2007.
The 303 area code covers the Denver metropolitan area. The 719 area code covers most of southern Colorado, including Pueblo, Colorado Springs, and Fountain. The 720 area code covers the northern suburbs of the Denver metropolitan area, including Boulder, Broomfield, Erie, and Longmont.


Area codes are telephone numbers that are assigned to specific geographical areas. In the United States, area codes are regulated by the Federal Communications Commission (FCC). Area codes are necessary because there are not enough available phone numbers to assign one to every person or business. Without area codes, it would be difficult to determine where a call should be directed. Area Codes also help to reduce the number of unused telephone numbers. By dividing the United States into geographic areas, each with its own Area Code, the number of available telephone numbers is increased.

All of the digits in an Area Code must be dialed when calling within that Area Code. For long-distance calls within the United States, the Area Code and the seven-digit telephone number must be dialed. The three-digit Area Code is not required when calling from one area code to another within the United States.

Area Codes for the Largest Cities in Colorado

CityArea CodeCityArea CodeCityArea Code
Arvada720/303Denver303/720Longmont720/303
Aurora303/720Englewood303/720Loveland303/720/970
Boulder303/720Fort Collins970Northglenn303/720
Brighton303/720Grand Junction970Parker303/720
Broomfield303/720Greeley970Pueblo719
Castle Rock303/720Highlands Ranch303/720Security-widefield719
Castlewood720/303Ken Caryl303/720Southglenn303/720
Colorado Springs719Lafayette303/720Thornton303/720
Columbine720/303Lakewood720/303Westminster720/303
Commerce City720/303Littleton720/303Wheat Ridge720/303

City/Area Code: Colorado

CityCountyArea CodeCityCountyArea Code
ArvadaJefferson County303DeltaDelta County970
AuroraAdams County303DillonSummit County970
AuroraArapahoe County303DinosaurMoffat County970
BennettArapahoe County303DoloresMontezuma County970
Black HawkGilpin County303Dove CreekDolores County970
BoulderBoulder County303DrakeLarimer County970
BroomfieldBroomfield County303DurangoLa Plata County970
Buffalo CreekJefferson County303EagleEagle County970
ByersArapahoe County303EatonWeld County970
Castle RockDouglas County303EckertDelta County970
Central CityGilpin County303EckleyYuma County970
Commerce CityAdams County303EdwardsEagle County970
ConiferJefferson County303EgnarSan Miguel County970
DaconoWeld County303Estes ParkLarimer County970
DenverDenver County303EvansWeld County970
DenverArapahoe County303FlemingLogan County970
DumontClear Creek County303Fort CollinsLarimer County970
DupontAdams County303FraserGrand County970
EastlakeAdams County303FriscoSummit County970
Eldorado SpringsBoulder County303FruitaMesa County970
ElizabethElbert County303GaletonWeld County970
EmpireClear Creek County303GatewayMesa County970
EnglewoodArapahoe County303GilcrestWeld County970
EvergreenJefferson County303Glade ParkMesa County970
FirestoneWeld County303Glen HavenLarimer County970
FrederickWeld County303Glenwood SpringsGarfield County970
GeorgetownClear Creek County303GranbyGrand County970
GoldenJefferson County303Grand JunctionMesa County970
GrantPark County303Grand LakeGrand County970
HudsonWeld County303GreeleyWeld County970
HygieneBoulder County303GroverWeld County970
Indian HillsJefferson County303GunnisonGunnison County970
JamestownBoulder County303GypsumEagle County970
KeenesburgWeld County303HaxtunPhillips County970
KiowaElbert County303HaydenRoutt County970
KittredgeJefferson County303HerefordWeld County970
LittletonArapahoe County303HesperusLa Plata County970
LongmontBoulder County303HillroseMorgan County970
LouisvilleBoulder County303HolyokePhillips County970
LouviersDouglas County303Hot Sulphur SpringsGrand County970
LyonsBoulder County303HotchkissDelta County970
NederlandBoulder County303IdaliaYuma County970
NiwotBoulder County303IgnacioLa Plata County970
PineJefferson County303IliffLogan County970
PinecliffeBoulder County303JoesYuma County970
RoggenWeld County303JohnstownWeld County970
RollinsvilleGilpin County303KerseyWeld County970
ShawneePark County303KirkYuma County970
Silver PlumeClear Creek County303KremmlingGrand County970
StrasburgAdams County303La SalleWeld County970
WardBoulder County303Lake CityHinsdale County970
WatkinsAdams County303LaporteLarimer County970
WestminsterJefferson County303LazearDelta County970
Wheat RidgeJefferson County303LewisMontezuma County970
AgateElbert County719LivermoreLarimer County970
AguilarLas Animas County719Log Lane VillageMorgan County970
AlamosaAlamosa County719LomaMesa County970
AlmaPark County719LovelandLarimer County970
AntonitoConejos County719LucerneWeld County970
ArapahoeCheyenne County719MackMesa County970
ArlingtonKiowa County719MancosMontezuma County970
ArribaLincoln County719MarvelLa Plata County970
AvondalePueblo County719MasonvilleLarimer County970
BethuneKit Carson County719Mc CoyEagle County970
BeulahPueblo County719MeadWeld County970
BlancaCostilla County719MeekerRio Blanco County970
BoncarboLas Animas County719MeredithPitkin County970
BoonePueblo County719MerinoLogan County970
BransonLas Animas County719MesaMesa County970
Buena VistaChaffee County719Mesa Verde National ParkMontezuma County970
CalhanEl Paso County719MillikenWeld County970
CampoBaca County719MinturnEagle County970
Canon CityFremont County719MolinaMesa County970
CapulinConejos County719MontroseMontrose County970
CascadeEl Paso County719NaturitaMontrose County970
CenterSaguache County719New CastleGarfield County970
ChamaCostilla County719New RaymerWeld County970
CherawOtero County719NorwoodSan Miguel County970
Cheyenne WellsCheyenne County719NuclaMontrose County970
ClimaxLake County719NunnWeld County970
Coal CreekFremont County719Oak CreekRoutt County970
CoaldaleFremont County719Ohio CityGunnison County970
Colorado CityPueblo County719OlatheMontrose County970
Colorado SpringsEl Paso County719OphirSan Miguel County970
ComoPark County719OrchardMorgan County970
ConejosConejos County719OtisWashington County970
CotopaxiFremont County719OurayOuray County970
CreedeMineral County719OvidSedgwick County970
CrestoneSaguache County719PadroniLogan County970
Cripple CreekTeller County719Pagosa SpringsArchuleta County970
CrowleyCrowley County719PalisadeMesa County970
Del NorteRio Grande County719PaoliPhillips County970
DivideTeller County719PaoniaDelta County970
EadsKiowa County719ParachuteGarfield County970
FlorenceFremont County719ParadoxMontrose County970
FlorissantTeller County719ParlinGunnison County970
Fort GarlandCostilla County719ParshallGrand County970
Fort LyonBent County719PeetzLogan County970
FountainEl Paso County719PhippsburgRoutt County970
FowlerOtero County719PierceWeld County970
GardnerHuerfano County719PitkinGunnison County970
GenoaLincoln County719PlacervilleSan Miguel County970
GranadaProwers County719Pleasant ViewMontezuma County970
Green Mountain FallsEl Paso County719PowderhornGunnison County970
GuffeyPark County719RandJackson County970
HartmanProwers County719RangelyRio Blanco County970
HartselPark County719Red CliffEagle County970
HastyBent County719Red Feather LakesLarimer County970
HaswellKiowa County719RedvaleMontrose County970
HillsideFremont County719RicoDolores County970
HoehneLas Animas County719RidgwayOuray County970
HollyProwers County719RifleGarfield County970
HomelakeRio Grande County719SedgwickSedgwick County970
HooperAlamosa County719SeibertKit Carson County970
HowardFremont County719SeveranceWeld County970
HugoLincoln County719SiltGarfield County970
JarosoCostilla County719SilverthorneSummit County970
JeffersonPark County719SilvertonSan Juan County970
KarvalLincoln County719SlaterMoffat County970
KimLas Animas County719SnowmassPitkin County970
Kit CarsonCheyenne County719Snowmass VillagePitkin County970
La JaraConejos County719SnyderMorgan County970
La JuntaOtero County719SomersetGunnison County970
La VetaHuerfano County719Steamboat SpringsRoutt County970
Lake GeorgePark County719SterlingLogan County970
LamarProwers County719StonehamWeld County970
Las AnimasBent County719TabernashGrand County970
LimonLincoln County719TellurideSan Miguel County970
ManassaConejos County719TimnathLarimer County970
Manitou SpringsEl Paso County719ToponasRoutt County970
ManzanolaOtero County719TowaocMontezuma County970
MathesonElbert County719VailEagle County970
Mc ClaveBent County719VernonYuma County970
MoffatSaguache County719VonaKit Carson County970
MonarchChaffee County719WaldenJackson County970
Monte VistaRio Grande County719WeldonaMorgan County970
MoscaAlamosa County719WellingtonLarimer County970
NathropChaffee County719WhitewaterMesa County970
Olney SpringsCrowley County719WigginsMorgan County970
OrdwayCrowley County719WindsorWeld County970
Palmer LakeEl Paso County719Winter ParkGrand County970
PenroseFremont County719WolcottEagle County970
PeytonEl Paso County719WoodrowWashington County970
Poncha SpringsChaffee County719Woody CreekPitkin County970
PritchettBaca County719WrayYuma County970
PuebloPueblo County719YampaRoutt County970
RamahEl Paso County719Yellow JacketMontezuma County970
RockvaleFremont County719YumaYuma County970
Rocky FordOtero County719ElbertElbert County303,719
RomeoConejos County719AllensparkBoulder County303,720
RushLincoln County719ArvadaJefferson County303,720
RyePueblo County719AuroraArapahoe County303,720
SaguacheSaguache County719BoulderBoulder County303,720
SalidaChaffee County719BrightonAdams County303,720
San LuisCostilla County719BroomfieldBroomfield County303,720
San PabloCostilla County719Castle RockDouglas County303,720
SanfordCostilla County719Commerce CityAdams County303,720
SargentsSaguache County719DenverDenver County303,720
Sheridan LakeKiowa County719DenverJefferson County303,720
SimlaElbert County719DenverAdams County303,720
South ForkRio Grande County719DenverArapahoe County303,720
SpringfieldBaca County719EnglewoodArapahoe County303,720
Sugar CityCrowley County719ErieWeld County303,720
SwinkOtero County719FranktownDouglas County303,720
TrincheraLas Animas County719GoldenJefferson County303,720
TrinidadLas Animas County719Idaho SpringsClear Creek County303,720
Twin LakesLake County719LittletonArapahoe County303,720
Two ButtesBaca County719LittletonDenver County303,720
U S A F AcademyEl Paso County719LittletonJefferson County303,720
VictorTeller County719LittletonDouglas County303,720
VilasBaca County719Lone TreeDouglas County303,720
Villa GroveSaguache County719LouisvilleBoulder County303,720
WalsenburgHuerfano County719MorrisonJefferson County303,720
WalshBaca County719ParkerDouglas County303,720
WestcliffeCuster County719SedaliaDouglas County303,720
WestonLas Animas County719ThorntonAdams County303,720
WetmoreCuster County719WestminsterAdams County303,720
Wild HorseCheyenne County719Wheat RidgeJefferson County303,720
WileyProwers County719Fort LuptonWeld County303,970
Woodland ParkTeller County719JulesburgSedgwick County308,970
YoderEl Paso County719MonumentEl Paso County719,303
AuroraArapahoe County720Woodland ParkTeller County719,303
DenverDenver County720Colorado SpringsEl Paso County719,720
AkronWashington County970BurlingtonKit Carson County719,970
AlmontGunnison County970FairplayPark County719,970
AmherstPhillips County970FlaglerKit Carson County719,970
AntonWashington County970LeadvilleLake County719,970
ArbolesArchuleta County970StrattonKit Carson County719,970
AspenPitkin County970ArvadaJefferson County720,303
AtwoodLogan County970AuroraArapahoe County720,303
AultWeld County970BaileyPark County720,303
AustinDelta County970BoulderBoulder County720,303
AvonEagle County970BrightonAdams County720,303
BasaltEagle County970BroomfieldJefferson County720,303
Battlement MesaGarfield County970DenverDenver County720,303
BayfieldLa Plata County970DenverJefferson County720,303
BedrockMontrose County970DenverAdams County720,303
BellvueLarimer County970DenverArapahoe County720,303
BondEagle County970EnglewoodArapahoe County720,303
BriggsdaleWeld County970HendersonAdams County720,303
BrushMorgan County970IdledaleJefferson County720,303
BurnsEagle County970LafayetteBoulder County720,303
CahoneDolores County970LittletonDouglas County720,303
CarbondalePitkin County970LittletonJefferson County720,303
CarrWeld County970LittletonArapahoe County720,303
CedaredgeDelta County970LongmontBoulder County720,303
Chimney RockArchuleta County970ParkerDouglas County720,303
ChromoArchuleta County970BerthoudLarimer County970,303
CimarronGunnison County970BreckenridgeSummit County970,303
ClarkRoutt County970Fort MorganMorgan County970,303
CliftonMesa County970GreeleyWeld County970,303
CoalmontJackson County970LovelandLarimer County970,303
CollbranMesa County970PlattevilleWeld County970,303
CopeWashington County970MaybellMoffat County970,435
CortezMontezuma County970LindonWashington County970,719
CoryDelta County970EvergreenJefferson County303,720,970
CowdreyJackson County970LittletonArapahoe County303,720,970
CraigMoffat County970Deer TrailArapahoe County303,970,719
CrawfordMontrose County970LongmontWeld County303,970,720
Crested ButteGunnison County970DenverDenver County720,303,719
CrookLogan County970LarkspurDouglas County720,303,719
De BequeGarfield County970LongmontBoulder County720,970,303