Snohomish County Washington is covered by a total of 39 ZIP Codes. There are 7 ZIP Codes in Snohomish County that extend into adjacent counties (Chelan County, Island County, King County, and Skagit County). Of the ZIP codes within or partially within Snohomish County there are 28 Standard ZIP Codes, 1 Unique ZIP Codes and 9 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 Snohomish County and can be turned on and off. Each type of postal code can also be turned on and off.