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Colorado Area Codes


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The State of Colorado got the rank of state in 1876. The state is renowned by its nick name, the "Centennial State". It is surrounded by the states of Wyoming, New Mexico, Oklahoma, Arizona, Nebraska and Utah.
Standard Time Zone followed in Colorado is Mountain Time Zone.
Colorados area codes providing telephone services in state are:

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

Major companies providing telephone services in Colorado are:
  • ALLEGIANCE TELECOM, INC. - CA
  • ALLTEL COMMUNICATIONS OF THE SOUTHWEST, LP - AZ
  • AMERICAN MESSAGING (AM), INC.
  • MPOWER COMMUNICATIONS CORP. - CA
  • NEW CINGULAR WIRELESS PCS, LLC
  • NEXTEL COMMUNICATIONS, INC.
  • PACIFIC BELL
  • QWEST CORPORATION
  • TIME WARNER TELECOM OF CALIFORNIA, L.P.
  • U.S. TELEPACIFIC CORP. - CA
  • USA MOBILITY WIRELESS, INC.

It was originally created in 1947 for serving the entire State. It is one of the eighty six original area codes which were proposed for USA by NANPA (North Numbering American Plan Administration). The code shares its geographical boundary with area code 720; both these area codes are overlaid areas.

It was formed on 5th March 1988 as a result in split of area code 303. It was created to provide relief to area code 303 which was getting exhausted at that time. The new code was introduced to provide numbering relief to area 303 as it was getting exhausted because of the ever-increasing demands for telephone lines. The Southeastern region of the state is served by the code 719.

It was added as an overlay to code 303 on 1st June 1998; the code serves Denver and Boulder.

The code was created to give relief to the exhausted area 303. Majority areas located in the Northern and Western side of the Colorado are served by area code 970

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