Area code 206

206area code
Area code 206 is a North American telephone area code in the U.S. state of Washington assigned to the numbering plan area (NPA) that includes the city of Seattle, Shoreline, Lake Forest Park, the islands of Mercer, Bainbridge, and Vashon, and portions of metropolitan Seattle from Des Moines to Woodway.wikipedia
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Overlay plan

overlayoverlaidoverlay area code
As of January 2017, this numbering plan area was one of the last urbanized areas in the North American Numbering Plan without a code overlay, meaning telephone calls within Seattle could still be originated by seven-digit dialing.
For example, the original area code for the entire state of Washington was 206; today 206 applies to only the city of Seattle and the immediate vicinity.

Woodway, Washington

WoodwayWoodway, WA
Area code 206 is a North American telephone area code in the U.S. state of Washington assigned to the numbering plan area (NPA) that includes the city of Seattle, Shoreline, Lake Forest Park, the islands of Mercer, Bainbridge, and Vashon, and portions of metropolitan Seattle from Des Moines to Woodway.
Woodway is the only city in Snohomish County in Area code 206.

List of original NANP area codes

original area codesoriginal 86 area codesoriginal numbering plan areas
Area code 206 was one of the original area codes assigned in 1947, and originally covered the entire state of Washington.

Area code 564

564
The area code 564 overlay was activated on January 28, 2017, and ten-digit dialing became required on July 29, 2017.
It is an overlay plan for area codes 206, 253, 360 and 425.

Area code 509

509(509)282
On January 1, 1957, area code 509 was assigned for the eastern two-thirds of Washington in a flash-cut, with the split roughly following the Cascade Mountains.
The 509 code was created in a split from 206, originally the area code for all of Washington, in a flash-cut on January 1, 1957.

Seattle

Seattle, WashingtonSeattle, WACity of Seattle
Area code 206 is a North American telephone area code in the U.S. state of Washington assigned to the numbering plan area (NPA) that includes the city of Seattle, Shoreline, Lake Forest Park, the islands of Mercer, Bainbridge, and Vashon, and portions of metropolitan Seattle from Des Moines to Woodway.

Shoreline, Washington

ShorelineShoreline, WACity of Shoreline
Area code 206 is a North American telephone area code in the U.S. state of Washington assigned to the numbering plan area (NPA) that includes the city of Seattle, Shoreline, Lake Forest Park, the islands of Mercer, Bainbridge, and Vashon, and portions of metropolitan Seattle from Des Moines to Woodway.

Lake Forest Park, Washington

Lake Forest Park
Area code 206 is a North American telephone area code in the U.S. state of Washington assigned to the numbering plan area (NPA) that includes the city of Seattle, Shoreline, Lake Forest Park, the islands of Mercer, Bainbridge, and Vashon, and portions of metropolitan Seattle from Des Moines to Woodway.

Mercer Island, Washington

Mercer IslandMercerMercer Island, WA
Area code 206 is a North American telephone area code in the U.S. state of Washington assigned to the numbering plan area (NPA) that includes the city of Seattle, Shoreline, Lake Forest Park, the islands of Mercer, Bainbridge, and Vashon, and portions of metropolitan Seattle from Des Moines to Woodway.

Area code 360

360360/564
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.
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.

Bainbridge Island, Washington

Bainbridge IslandBainbridgeBainbridge Island, WA
Area code 206 is a North American telephone area code in the U.S. state of Washington assigned to the numbering plan area (NPA) that includes the city of Seattle, Shoreline, Lake Forest Park, the islands of Mercer, Bainbridge, and Vashon, and portions of metropolitan Seattle from Des Moines to Woodway.

Des Moines, Washington

Des MoinesCity of Des MoinesDes Moines Police Department
Area code 206 is a North American telephone area code in the U.S. state of Washington assigned to the numbering plan area (NPA) that includes the city of Seattle, Shoreline, Lake Forest Park, the islands of Mercer, Bainbridge, and Vashon, and portions of metropolitan Seattle from Des Moines to Woodway.

List of North American Numbering Plan area codes

List of North American area codesArea CodesNPA
* List of NANP area codes

Area code 253

253
The southern portion, including Tacoma, received area code 253, while the northern portion, including Everett and the Eastside, was assigned area code 425.
The area code went into service on April 27, 1997, as part of a three-way split of area code 206.

Area code 425

425425 844
The southern portion, including Tacoma, received area code 253, while the northern portion, including Everett and the Eastside, was assigned area code 425.
The area code went into service on April 27, 1997, as part of a three-way split of area code 206 (the other of the three is 253).

North America

NorthNAAmerica
Area code 206 is a North American telephone area code in the U.S. state of Washington assigned to the numbering plan area (NPA) that includes the city of Seattle, Shoreline, Lake Forest Park, the islands of Mercer, Bainbridge, and Vashon, and portions of metropolitan Seattle from Des Moines to Woodway.

Telephone

phonetelephonesLocal Telephone Service
Area code 206 is a North American telephone area code in the U.S. state of Washington assigned to the numbering plan area (NPA) that includes the city of Seattle, Shoreline, Lake Forest Park, the islands of Mercer, Bainbridge, and Vashon, and portions of metropolitan Seattle from Des Moines to Woodway.

Telephone numbering plan

Area codeCalling codearea codes
Area code 206 is a North American telephone area code in the U.S. state of Washington assigned to the numbering plan area (NPA) that includes the city of Seattle, Shoreline, Lake Forest Park, the islands of Mercer, Bainbridge, and Vashon, and portions of metropolitan Seattle from Des Moines to Woodway.

U.S. state

Statestatesstatehood
Area code 206 is a North American telephone area code in the U.S. state of Washington assigned to the numbering plan area (NPA) that includes the city of Seattle, Shoreline, Lake Forest Park, the islands of Mercer, Bainbridge, and Vashon, and portions of metropolitan Seattle from Des Moines to Woodway.

Washington (state)

WashingtonWashington StateWA
Area code 206 is a North American telephone area code in the U.S. state of Washington assigned to the numbering plan area (NPA) that includes the city of Seattle, Shoreline, Lake Forest Park, the islands of Mercer, Bainbridge, and Vashon, and portions of metropolitan Seattle from Des Moines to Woodway.

Vashon, Washington

VashonVashon IslandVashon Island, Washington
Area code 206 is a North American telephone area code in the U.S. state of Washington assigned to the numbering plan area (NPA) that includes the city of Seattle, Shoreline, Lake Forest Park, the islands of Mercer, Bainbridge, and Vashon, and portions of metropolitan Seattle from Des Moines to Woodway.

North American Numbering Plan

Area codeArea codesArea code(s)
As of January 2017, this numbering plan area was one of the last urbanized areas in the North American Numbering Plan without a code overlay, meaning telephone calls within Seattle could still be originated by seven-digit dialing.

Seven-digit dialing

7-digit dialing7-digit diallingseven-digit dialling
As of January 2017, this numbering plan area was one of the last urbanized areas in the North American Numbering Plan without a code overlay, meaning telephone calls within Seattle could still be originated by seven-digit dialing.

Ten-digit dialing

10-digit dialingten-digit diallingten digits
The area code 564 overlay was activated on January 28, 2017, and ten-digit dialing became required on July 29, 2017.

Flash cut

flash-cutflash-cuttingflash cutover
On January 1, 1957, area code 509 was assigned for the eastern two-thirds of Washington in a flash-cut, with the split roughly following the Cascade Mountains.