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Area Code — 303

Phone numbers in area code 303 cover these cities in CO:

Arvada, Denver, Wheat Ridge, Westminster, Aurora, Buckley Afb, Buckley Air Force Base, Buckley Air Natl Guard Base, Buckley Ang, Centennial, Foxfield, Broomfield, Adams City, Brighton, Commerce City, Irondale, Thornton, Dupont, Eldorado Sprg, Eldorado Springs, Lafayette, Louisville, Superior, Bennett, Byers, Castle Rock, Deer Trail, Elizabeth, Castle Pines, Cherry Hills, Cherry Hills Village, Cherry Hl Vlg, Englewood, Greenwood Village, Greenwood Vlg, Sheridan, Lone Tree, Franktown, Kiowa, Larkspur, Littleton, Grants Ranch, Bow Mar, Columbine Valley, Columbine Vly, Lakewood, Lonetree, Roxborough, Hghlnds Ranch, Highlands Ranch, Louviers, Parker, Deckers, Sedalia, Strasburg, Watkins, Littleton City Offices, Arapahoe County Offices, University Of Denver, Lakeside, Edgewater, Federal Heights, Federal Hgts, Northglenn, Denver Federal Center, Welby, Lowry, Montclair, North Glenn, Fort Logan, Ft Logan, Montbello, East Lake, Eastlake, Colorado D M V Dept Of Rev, U S West Communications, Glendale, National Farmers Union, Bank Americard, Us Bank, Us Court Of Appeals 10th Cir, Small Business Adm, Colorado Dept Of Revenue, Univ Of Colorado Med Ctr, Affiliated Banks Service Co, Wells Fargo Bank, Blue Cross Blue Shield Of Co, Af Acctg & Finance Ctr, Af Reserve Pers Ctr, Federal Bldg/us Courthouse, Western Area, Boulder, University Of Colorado, Residence Halls Univ Of Co, I B M, Neodata Business Reply, Neodata, Evergreen, Golden, Blackhawk, Rollinsville, Jefferson County, Bailey, Black Hawk, Buffalo Creek, Central City, Como, Fairplay, Aspen Park, Conifer, Foxton, Dumont, Empire, Georgetown, Grant, Shawnee, Idaho Springs, Idledale, Indian Hills, Jamestown, Kittredge, Morrison, Nederland, Pine, Pinecliffe, Silver Plume, Ward, Longmont, Niwot, Firestone, Frederick, Allenspark, Dacono, Erie, Hygiene, Lyons, Lochbuie, Fort Lupton, Ft Lupton, Wattenburg, Henderson, Hudson, Keenesburg, Roggen

The 303 area code covers these zip codes in CO:

80001, 80002, 80003, 80004, 80005, 80006, 80007, 80010, 80011, 80012, 80013, 80014, 80015, 80016, 80017, 80018, 80019, 80020, 80021, 80022, 80023, 80024, 80025, 80026, 80027, 80030, 80031, 80033, 80034, 80035, 80036, 80037, 80038, 80040, 80041, 80042, 80044, 80045, 80046, 80047, 80102, 80103, 80104, 80105, 80107, 80108, 80109, 80110, 80111, 80112, 80113, 80116, 80117, 80118, 80120, 80121, 80122, 80123, 80124, 80125, 80126, 80127, 80128, 80129, 80130, 80131, 80134, 80135, 80136, 80137, 80138, 80150, 80151, 80155, 80160, 80161, 80162, 80163, 80165, 80166, 80201, 80202, 80203, 80204, 80205, 80206, 80207, 80208, 80209, 80210, 80211, 80212, 80214, 80215, 80216, 80217, 80218, 80219, 80220, 80221, 80222, 80223, 80224, 80225, 80226, 80227, 80228, 80229, 80230, 80231, 80232, 80233, 80234, 80235, 80236, 80237, 80238, 80239, 80241, 80243, 80244, 80246, 80247, 80248, 80249, 80250, 80251, 80252, 80256, 80257, 80259, 80260, 80261, 80262, 80263, 80264, 80265, 80266, 80271, 80273, 80274, 80279, 80280, 80281, 80290, 80291, 80293, 80294, 80295, 80299, 80301, 80302, 80303, 80304, 80305, 80306, 80307, 80308, 80309, 80310, 80314, 80321, 80322, 80323, 80328, 80329, 80401, 80402, 80403, 80419, 80421, 80422, 80425, 80427, 80432, 80433, 80436, 80437, 80438, 80439, 80444, 80448, 80452, 80453, 80454, 80455, 80457, 80465, 80466, 80470, 80471, 80474, 80475, 80476, 80481, 80501, 80502, 80503, 80504, 80510, 80514, 80516, 80520, 80530, 80533, 80540, 80544, 80601, 80602, 80603, 80614, 80621, 80640, 80642, 80643, 80652

Rate centers:

DENVER , AURORA , BRIGHTON , DENVERSLVN , FORTLUPTON , DECKERS , LONGMONT , HUDSON , GEORGETOWN , KEENESBURG , STRASBURG , BENNETT , DEER TRAIL , ALLNSPKLYN , BYERS , ROGGEN

Companies:

TELEPORT COMMUNICATIONS GROUP , USA MOBILITY WIRELESS, INC. , QWEST CORPORATION , AMERICAN MESSAGING (AM), INC. , CELLCO PARTNERSHIP DBA VERIZON WIRELESS , MCIMETRO ACCESS TRANSMISSION SERVICES LLC , NEXTEL COMMUNICATIONS, INC. , CONTACT PAGING OF COLORADO, INC. , ILOKA, INC. DBA MICROTECH-TEL , T-MOBILE USA, INC. , NEW CINGULAR WIRELESS PCS, LLC , CBEYOND COMMUNICATIONS, LLC , ESCHELON TELECOM OF COLORADO, INC. , BANDWIDTH.COM CLEC, LLC , PAC - WEST TELECOMM, INC. , YMAX COMMUNICATIONS CORP. , 360NETWORKS (USA) INC. , GLOBAL CROSSING LOCAL SERVICES, INC. , ICG TELECOM GROUP , SPRINT SPECTRUM L.P. , LEVEL 3 COMMUNICATIONS, LLC , N.E. COLORADO CELLULAR, INC. , MCLEODUSA TELECOMMUNICATIONS SERVICES, INC. , AT&T LOCAL , CONVERGENT COMMUNICATIONS, INC. , COMCAST PHONE OF COLORADO, LLC , XO COLORADO, LLC , ELBERT COUNTY WIRELESS, LLC , LIVE WIRE NETWORKS, INC. , COMMPARTNERS, LLC , 4DVISION, LLC , STRASBURG TELEPHONE CO. , EASTERN SLOPE RURAL TELEPHONE ASSOCIATION, INC. , BIG RIVER TELEPHONE COMPANY, LLC - MO , COMMUNICATIONS UNLIMITED , BIJOU TELEPHONE COOPERATIVE ASSOCIATION, INC. , TW TELECOM OF COLORADO LLC , INTERLINK ADV SVC D/B/A FORETHOUGHT.NET , ROGGEN TELEPHONE COOPERATIVE CO. , NEXTWAVE TELECOM, INC DBA NEXTWAVE WIRELESS , ALLEGIANCE TELECOM OF COLORADO, INC. , NEUTRAL TANDEMLORADO, LLC

List of 303 Area-Code Phone Number Prefixes