The U.S. state of Oregon is divided into two telephone numbering plan areas in the North American Numbering Plan (NANP), which are served by a two overlay area codes each.
In the initial nationwide telephone numbering plan of 1947, Oregon was a single numbering plan area with area code 503. Area code 541 was split off in 1995, the 971 overlay of 503 became active in 2000, and the 458 overlay of 541 became active in 2010.
Area code Year ParentNPA Overlay Numbering plan area 503 1947 – 503/971 Northwestern corner of Oregon, including Portland and its metropolitan area, Salem and other cities 971 2000 503 541 1995 503 458/541 All of Oregon outside the northwestern corner, including Eugene 458 2010 541
See also List of North American Numbering Plan area codes
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