Area code 970

Area code 970 is a telephone area code in the North American Numbering Plan (NANP) serving most of the western and northern parts of Colorado. The numbering plan area includes Aspen, Breckenridge, Durango, Estes Park, Fort Collins, Glenwood Springs, Grand Junction, Greeley, Loveland, Silverthorne, Steamboat Springs, and Vail. It was established on April 2, 1995 as a split from area code 303, which was retained by the Denver area.[2] The split did not affect local calls; they remained local with seven-digit dialing, even when the destination had received the new area code.

Area code 970Area codes 303 and 720Area code 719Area code 785Area code 308Area code 307Area code 435Area code 928Area code 575Area code 505Area code 580Area code 620
Clickable map of Colorado area codes in blue (with bordering states).[1]

Ten-digit dialingEdit

Area code 970 has PCS telephone numbers assigned for the central office code 988 in the Fort Collins exchange.[3] As of October 17, 2020, 988 has been assigned by law as a three-digit code for the National Suicide Prevention Lifeline. To avoid conflicts in switching systems, the Federal Communications Commission has ordered telecommunication carriers of 83 area codes, including 970, to transition to ten-digit dialing, even when the area code is not part of an overlay plan. Alternatively, the 988 prefix may be retired in the local numbering plan. Per the timeline set by the North American Numbering Plan Administrator, permissive dialing begins on April 24, 2021 and ten-digit dialing is required starting on October 24, 2021.[4]

Area code 719, serving northern and western Colorado, will also be affected by this change. With 303, having been overlaid with 720 since 1998, this change will break seven-digit dialing in Colorado by the end of 2021.

See alsoEdit


  1. ^ "Area Codes Map, Colorado". NANPA. Retrieved 2018-04-24.
  2. ^ NANP Information Letter 94/09-012
  3. ^ Assignment of 988 prefix in Fort Collins, Retrieved 2021-04-05
  4. ^ "Transition to 10-digit dialing (for 988 as 3-digit access to National Suicide Prevention Hotline)" (PDF). NANPA. 2021-01-08. Retrieved 2021-04-05.

External linksEdit

Colorado area codes: 303/720, 719, 970
North: 307, 308
West: 435 area code 970 East: 303/720, 719, 785
South: 303/720, 505, 575, 719
Kansas area codes: 316, 620, 785, 913
Nebraska area codes: 308, 402/531
New Mexico area codes: 505, 575
Utah area codes: 385/801, 435
Wyoming area codes: 307

Coordinates: 39°N 106°W / 39°N 106°W / 39; -106