Why Washington State Has Six Area Codes

Washington's Original Code: 509

In 1947, the entire state of Washington was assigned a single area code: 509. At the time, that was enough. Washington had fewer than 2 million residents, most telephone lines were landlines, and a single code could comfortably serve the state for the foreseeable future.

Area code 509 remains active today, serving eastern Washington — a vast agricultural and ranching region that includes Spokane, Yakima, the Tri-Cities (Kennewick, Pasco, Richland), Walla Walla, and Wenatchee.

206: The Western Washington Split

As Seattle and the Puget Sound region exploded in population, the original 509 code was split in the early 1990s. Area code 206 was retained for the Seattle metropolitan core — essentially Seattle and its immediate surroundings — while 509 continued to serve eastern Washington.

The Growth of Puget Sound: 253, 360, 425

The Puget Sound's rapid growth through the 1990s and 2000s drove three more splits:

• 253 — South Sound region: Tacoma, Federal Way, Auburn, and surrounding areas
• 360 — Western Washington outside the Seattle metro: Olympia, Bellingham, Everett (northern), Vancouver (WA), and the Olympic Peninsula
• 425 — The Eastside: Bellevue, Redmond, Kirkland, Everett, and the suburbs east and north of Seattle

564: Seattle's Overlay

Even with five area codes, the Seattle metro continued to generate demand for new numbers. Rather than carve out yet another geographic territory, regulators introduced area code 564 as an overlay for the 206/253/425 region. This means 564 numbers coexist with 206, 253, and 425 numbers in the same geographic areas.

Washington's Six Codes Today

Washington's six area codes reflect the state's geographic and demographic divide: the dense, tech-driven urban corridor of Puget Sound on the west side, and the wide-open agricultural east. Each code tells a piece of that story. You can see all Washington area codes on the Washington state page.