Area code 360

360360/564
Area code 360 is the telephone area code for western Washington state outside metropolitan Seattle.wikipedia
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Area code 334

334
Area codes 360 and 334 (Alabama), which began service on the same day, were the first two area codes in the North American Numbering Plan with a middle digit other than 0 or 1.
The 334 area code was the first area code not to take the N1X or N0X form (i.e., the middle digit is neither 0 nor 1) in the North American Numbering Plan, preceding Washington area code 360 by one minute.

North American Numbering Plan

Area codeArea codesArea code(s)
Area codes 360 and 334 (Alabama), which began service on the same day, were the first two area codes in the North American Numbering Plan with a middle digit other than 0 or 1.
The first area codes without a 1 or 0 as the middle digit were area code 334 in Alabama and area code 360 in Washington, which both began service on January 15, 1995.

Area code 206

206area code
The numbering plan area (NPA), which encompasses all of western Washington outside urban King, Pierce, and Snohomish counties and Bainbridge Island, was previously part of area code 206.
Finally, on January 15, 1995, most of the old 206 territory outside of the Seattle/Tacoma area split off as area code 360, which was one of the first two area codes not conforming to the N0X/N1X format.

Area code 564

564
In 1999, numbering plan area 360 was to be overlaid with area code 564, but the implementation was delayed indefinitely by order of the Washington Utilities and Transportation Commission.
It is an overlay plan for area codes 206, 253, 360, and 425.

List of Washington area codes

Washington area codeslistTelephone area codes in Washington
In 1995, 206 was split again covering just the Puget Sound region after area code 360 was created to cover the remaining area.

Point Roberts, Washington

Point RobertsPoint Roberts, WA
Along with the rest of Whatcom County, Point Roberts moved to area code 360 in 1995.