Area Code 206 History - Washington

Significant events for area code 206

1947 Original area code for all of Washington.
1957 Area code was split, with 509 covering the eastern 2/3 of the state.
1995 Area code was split with 360 forming (a sort of) "doughnut" around the Seattle metro area. The two parts of 360 are not contiguous.
1997 A three-way split of 206, with 253 covering south of the Seattle metro area and 425 covering the area north and east.