Westmoreland County Pennsylvania is covered by a total of 91 ZIP Codes. There are 19 ZIP Codes in Westmoreland County that extend into adjacent counties (Allegheny County, Armstrong County, Butler County, Fayette County, Indiana County, Somerset County, and Washington County). Of the ZIP codes within or partially within Westmoreland County there are 59 Standard ZIP Codes, 3 Unique ZIP Codes and 28 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 Westmoreland County and can be turned on and off. Each type of postal code can also be turned on and off.