Somerset County New Jersey is covered by a total of 34 ZIP Codes. There are 10 ZIP Codes in Somerset County that extend into adjacent counties (Hunterdon County, Mercer County, Middlesex County, Morris County, and Union County). Of the ZIP codes within or partially within Somerset County there are 27 Standard ZIP Codes and 7 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 Somerset County and can be turned on and off. Each type of postal code can also be turned on and off.