King County Washington is covered by a total of 122 ZIP Codes. There are 6 ZIP Codes in King County that extend into adjacent counties (Kittitas County, Pierce County, and Snohomish County). Of the ZIP codes within or partially within King County there are 83 Standard ZIP Codes, 7 Unique ZIP Codes and 32 PO Box ZIP Codes.
Click on the ZIP Codes in the interactive map to view more information. The map control in the upper right corner can be used to toggle map layers on and off. The red outline is the border of King County and can be turned on and off. Each type of postal code can also be turned on and off.