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 numbering plan area (NPA) serves all of western Washington outside urban King, Pierce, and Snohomish counties and Bainbridge Island, Until January 15, 1995, when the area code commenced service, the numbering plan area (NPA) was served by area code 206, Washington's original area code since 1947.
Since 2017, area code 360 has been overlaid with area code 564. Additional NPAs in western Washington will be overlaid with 564 as well when numbering shortages demand relief.