Armstrong County Pennsylvania is covered by a total of 38 ZIP Codes. There are 18 ZIP Codes in Armstrong County that extend into adjacent counties (Butler County, Clarion County, Indiana County, Jefferson County, and Westmoreland County). Of the ZIP codes within or partially within Armstrong County there are 28 Standard ZIP Codes and 10 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 Armstrong County and can be turned on and off. Each type of postal code can also be turned on and off.