206 is the North American telephone area code in the U.S. state of Washington for Seattle, the islands of Mercer, Bainbridge and Vashon, and portions of the Seattle metro area from Des Moines to Woodway.
Area code 206 was one of the original area codes created in 1947. In 1957, area code 509 was created for the area east of the Cascades in a flash-cut. It split to form area 360 (one of the first 2 area codes not of N0X/N1X form) in 1995, and underwent a 3-way split in 1997 to form areas 253 and 425.
[edit]See also
List of Washington area codes
Area code 564
List of NANP area codes
[edit]External links
NANPA Washington area code map
List of exchanges from AreaCodeDownload.com, 206 Area Code
State of Washington area codes: 206, 253, 360, 425, 509
North: 425, 360
West: 360 Area Code 206 East: 425, 509
South: 253, 360
206 is a legit WA area code but 206-557 is an invalid exchange and why you got the error message. The caller is spoofing his number and should be treated as hostile.