Washington County Pennsylvania is covered by a total of 61 ZIP Codes. There are 10 ZIP Codes in Washington County that extend into adjacent counties (Allegheny County, Beaver County, Fayette County, Greene County, and Westmoreland County). Of the ZIP codes within or partially within Washington County there are 36 Standard ZIP Codes and 25 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 Washington County and can be turned on and off. Each type of postal code can also be turned on and off.