Union County New Jersey is covered by a total of 31 ZIP Codes. There are 4 ZIP Codes in Union County that extend into adjacent counties (Essex County, Morris County, and Somerset County). Of the ZIP codes within or partially within Union County there are 26 Standard ZIP Codes and 4 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 Union County and can be turned on and off. Each type of postal code can also be turned on and off.