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Area Code 303


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Area Code 303 was proposed in 1947 for serving the entire State of Colorado - State of United States. The code 303 is one of the eighty six original area codes which were proposed for USA by NANPA (North Numbering American Plan Administration). The particular code shares its geographical boundary with area code 720. Both these area codes are overlaid areas and are serving several areas located within the State of Colorado.

Ten digit dialing is mandatory for connecting to exact destination within the service area -- even while making a local phone call. Entire State of Colorado was served by area code 303 until 1988 when the code 303 got a split because of the population growth and shortage of available phone numbers. As a result code 719 was created on 5th March 1988. Later on, in 1995, telephone code 303 split off again and gave birth to new area code - 970. The 303 area code was overlaid by the code 720 on 1st June 1988. Standard Time Zone followed by the code 303 is Mountain Time Zone.

The State of Colorado is served by total four area codes:

  • 303 (Created in 1947)
  • 719 (Created in 1988)
  • 720 (Created in 1998)
  • 970 (created in 1995)

The 303 area code is covered from all four sides by area codes:
  • West: code 970
  • North: code 970
  • East: code 719
  • South: code 719

List of Counties:


  • ADAMS
  • ARAPAHOE
  • BOULDER
  • BROOMFIELD
  • CLEAR CREEK
  • DENVER
  • DOUGLAS
  • EL PASO
  • ELBERT
  • GILPIN
  • JEFFERSON
  • LARIMER
  • MORGAN
  • PARK
  • SUMMIT
  • TELLER
  • WELD

List of Cities:


  • Allenspark
  • Arvada
  • Aurora
  • Bailey
  • Bennett
  • Boulder
  • Brighton
  • Broomfield
  • Byers
  • Castle Rock
  • Central City
  • Clear Creek Canyon
  • Deckers
  • Deer Trail
  • Denver
  • Elbert
  • Elizabeth
  • Englewood
  • Erie
  • Evergreen
  • Frederick
  • Ft Lupton
  • Georgetown
  • Golden
  • Hudson
  • Idaho Springs
  • Keenesburg
  • Kiowa
  • Lafayette
  • Lakewood
  • Littleton
  • Longmont
  • Lookout Mountain
  • Lyons
  • Montbello
  • Morrison
  • Nederland
  • Parker
  • Roggen
  • Strasburg
  • Sullivan
  • Ward
  • Westminster

Leading institutions, ISPs and Telephone companies:

Some of the leading educational institutions serving the area of code 303 are:
Some of the ISPs offering dialup and dedicated services for the people of 303 areas are:
  • A plus Access
  • A Silicon Networks
  • A Value Access Providers--- VAP
  • Access Kentucky
  • American Family Online
  • Bayarea Internet Solutions
  • Best Rate ISP
  • Black Cat Solutions, Inc.
  • Cybercomm Online Services
  • Cut Rate Internet Service
  • Covad Communications

Some of the main carriers and telephone companies for 303 areas are:

  • ACS WIRELESS, INC.
  • ALLEGIANCE TELECOM, INC. - CA
  • ALLTEL MOBILE COMMUNICATIONS, INC. - ALABAMA
  • BROADWING COMMUNICATINS. LLC - CA
  • CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL
  • COOK TELECOM, INC.
  • COX CALIFORNIA TELCOM, INC. - CA
  • GLOBAL CROSSING LOCAL SERVICES, INC.-CA
  • LEAP WIRELESS INTL, INC. DBA CRICKET COMM, INC.
  • LEVEL 3 COMMUNICATIONS, LLC - CA
  • NETWORK SERVICES LLC
  • NEW CINGULAR WIRELESS PCS, LLC
  • NEXTEL COMMUNICATIONS, INC.
  • PAC - WEST TELECOMM, INC.
  • PACIFIC BELL - CLEC
  • PAETEC COMMUNICATIONS, INC. - CA
  • QWEST CORPORATION
  • SOUTHERN TELCOM NETWORK, INC. - AR
  • SOUTHWESTERN BELL
  • U.S. TELEPACIFIC CORP. - CA
  • USA MOBILITY WIRELESS, INC.
  • VANTAGE TELECOM, LLC, DBA NEWROADS TELECOM-AR
  • VERIZON CALIFORNIA INC.-CA (GTE)
  • YMAX COMMUNICATIONS CORP. - AZ

Reverse Phone Check for the area code 303:


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