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The North American Numbering Plan (NANP) divides the territories of its members into geographic numbering plan areas (NPAs). Each NPA is identified by one or more numbering plan area codes (NPA codes, or area codes), consisting of three digits that are prefixed to each local telephone number having seven digits.
971: An overlay of area code 503. Until 2008, 971 was a concentrated overlay, meaning it was only present in some parts of the 503 area. Today it is a standard overlay. 458: An overlay of area code 541. Under the original North American Numbering Plan of 1947, area code 503 covered all of Oregon. Area code 541 was split off in 1995, the 971 ...
The U.S. state of Washington has six telephone area codes. The state initially used a single area code until it was divided in 1957 with the creation of area code 509 to serve Eastern Washington. In 1995, 206 was split again to serve just the Puget Sound region after area code 360 was created for the remainder of Western Washington.
The 219 area code covers the northwest part of the state, including the cities of Gary, Hammond, Merrillville, Valparaiso and Michigan City. The 574 area code covers north-central Indiana, and includes the cities of South Bend, North Judson and Warsaw. The 260 area code covers the northeast section of Indiana, including Fort Wayne and Angola.
Area codes 541 and 458 are telephone area codes in the North American Numbering Plan (NANP) for most of the U.S. state of Oregon, excluding only the northwestern corner of the state. The service area includes the cities of Eugene , Springfield , Corvallis , Albany , Medford , Bend , Ashland , Klamath Falls , The Dalles , Burns , Lakeview , and ...
The largest telephone numbering plan in North American is the North American Numbering Plan (NANP), serving 25 regions or countries. Other countries maintain an autonomous numbering plan with distinct country codes within the international E.164 specifications by the International Telecommunication Union. Original North American area codes
The first nationwide telephone numbering plan of 1947 divided Ohio into four numbering plan areas (NPAs), roughly forming a quadrant layout for telecommunication services in the state. Area code 419 was assigned to the northwest quadrant of the state. The overlay area code 567 was created on January 1, 2002. Despite the presence of Toledo, the ...
From 1947 to 1957, all of Washington state was assigned area code 206 for routing long-distance telephone calls in Operator Toll Dialing.In 1957, the numbering plan area (NPA) was reduced to just the western part of the state, with most of the state east of the Cascade Mountains becoming area code 509.