206 Area Code — Seattle, WA

What is area code 206 and where does it cover?

Area code 206 serves Seattle and nearby inner communities such as Shoreline, Lake Forest Park, Mercer Island, Bainbridge Island, Vashon Island, and parts of Des Moines/Burien/White Center. It now forms an overlay complex with 564 across the same footprint.

How did area code 206 evolve over time?

• 1947: 206 created as statewide for Washington.

• 1957: Eastern Washington split to 509.

• 1995: Much of western Washington outside the core Seattle area split to 360.

• 1997: Further splits created 425 (north/Eastside) and 253 (south/Tacoma).

• 2025: Overlay 564 extended to 206 (already overlaying 360 since 2017) to ensure future numbers.

What are the current dialing rules and key dates for 206/564?

• Western WA 10-digit dialing: Mandatory since July 29, 2017 (introduced alongside 360/564 overlay planning).

• June 10, 2025: 564 overlay went in-service for the 206 region; new numbers may receive 564.

Existing 206 numbers remain unchanged. Customers must continue using 10 digits for all local calls.

Which cities and neighborhoods are most associated with 206?

Core 206 communities include Seattle, Shoreline, Lake Forest Park, Mercer Island, Bainbridge Island, Vashon Island, and parts of Des Moines and Burien - essentially Seattle and its innermost suburbs.

Why did Washington expand overlay 564 to 206?

Regulators projected number exhaustion in the 206 NPA and approved expanding 564 (already active over 360) to avoid renumbering existing subscribers. Overlays are the preferred relief because they preserve current numbers while adding capacity.

What interesting facts are tied to 206?

• Iconic city code: “206” is widely used as a shorthand for Seattle in media and culture.

• One code, many eras: 206 has shrunk from a statewide code (1947) to Seattle-centric after the 1957/1995/1997 splits - then grew into a modern overlay with 564 in 2025.