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Area code 360 is a telephone area code in the North American Numbering Plan (NANP) for all of Washington state outside metropolitan Seattle and west of the Cascade Mountains.
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 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.
Quick Take: List of Scam Area Codes. More than 300 area codes exist in the United States alone which is a target-rich environment for phone scammers.
An area code overlay is a numbering plan area (NPA) in the North American Numbering Plan ... 564 initially overlays only 360, but will expand to overlay 206, ...
In a phased example, area code 564 was implemented initially only on area code 360 in 2017, but will expand to three other codes when needed, in western Washington. A boundary-extension overlay is a type in which one or more neighboring numbering plan areas (with an overlay code or a primary area code) is expanded.
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Area code 564 was finally implemented on August 28, 2017. [6] Ten-digit dialing had been mandatory since July 29, 2017, for all local calls in Western Washington. [7] Since September 30, 2017, telephone numbers with the area code 564 have been issued in the existing number plan area 360. [8]