Mercer County, New Jersey ZIP Codes

22 ZIP Codes

Zip Code
City
Population
08540Princeton50,388
08618Trenton35,634
08610Trenton33,465
08611Trenton31,995
08648Lawrence Township31,323
08520Hightstown29,504
08619Trenton24,089
08638Trenton22,816
08550Princeton Junction21,067
08690Trenton18,841
08691Robbinsville16,607
08609Trenton15,938
08534Pennington13,272
08629Trenton13,013
08620Trenton11,621
08628Trenton9,831
08525Hopewell4,522
08544Princeton4,392
08560Titusville3,245
08542Princeton2,533
08608Trenton1,250
08561Windsor325

Overview of ZIP Codes in Mercer County

ZCTAs are geographic areas created by the US Census Bureau to approximate the delivery areas of ZIP Codes for statistical analysis. While ZCTAs use the same five-digit codes as ZIP Codes, they represent defined geographic areas that may not exactly match the mail delivery routes of ZIP Codes.
22
ZIP Codes

The data shown reflect ZCTAs from the US Census. As of 2025, there are 22 ZCTAs in Mercer County, New Jersey (US Census).