Area codes 503 and 971

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"Area code 503" redirects here. For the country code 503, see Telephone numbers in El Salvador.
  Area Codes 503 and 971

North American telephone area codes 503 and 971 serve the northwestern region of Oregon, including the Portland, Salem, and Astoria metropolitan areas.

History[edit]

Area code 503 was one of the original area codes created as part of the North American Numbering Plan by AT&T and Bell Laboratories in 1947.[1]

Area code 503 was used for the entire state of Oregon until November 5, 1995, when area code 541 began service. With that change, the northwest, and most heavily populated, corner of the state retained the 503 area code and the rest of the state moved to 541.[2]

On July 1, 1999, area code 971 was added to share the service area, with the exceptions of Clatsop and Tillamook counties.[3] Initially, 10-digit dialing was to become mandatory in that service area on January 30, 2000, but the date was extended until October 1, 2000.[4]

The previously exempted Clatsop and Tillamook counties were added to the 503/971 overlay on April 27, 2008.[5]

Service area[edit]

Area codes 503 and 971 include communities in the following counties:

References[edit]

  1. ^ "Area Code History". Retrieved May 25, 2012. 
  2. ^ "Split of 503 (Oregon) Numbering Plan Area (NPA)". North American Numbering Plan Administration. May 19, 1995. Retrieved May 25, 2012. 
  3. ^ "Concentrated Overlay of 503 Numbering Plan Area (NPA) with 971 NPA". North American Numbering Plan Administration. July 21, 1999. Retrieved May 25, 2012. 
  4. ^ "Permissive Dialing Extended for the 503/971 Concentrated Overlay (Oregon)". North American Numbering Plan Administration. December 10, 1999. Retrieved May 25, 2012. 
  5. ^ "Expansion of the Concentrated NPA 971 Overlay with NPA 503 (Oregon)". North American Numbering Plan Administration. December 21, 2006. Retrieved May 25, 2012. 

See also[edit]

Oregon area codes: 458, 503, 541, 971
North: 360
West: Pacific Oceanarea codes 503/971East: 458/541
South: 458/541
Washington area codes: 206, 253, 360, 425, 509

Coordinates: 45°30′N 123°00′W / 45.5°N 123°W / 45.5; -123