There are 22 zip codes in Mercer County, New Jersey. The most populated is 8540, located in Princeton. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
City
Population
08540Princeton48,513
08618Trenton39,047
08610Trenton32,324
08611Trenton31,660
08648Lawrence Township31,626
08520Hightstown29,296
08638Trenton23,804
08619Trenton23,446
08550Princeton Junction20,954
08690Trenton19,959
08691Robbinsville16,935
08629Trenton13,075
08534Pennington12,990
08620Trenton12,913
08609Trenton12,799
08628Trenton9,107
08525Hopewell4,554
08544Princeton4,504
08560Titusville3,689
08542Princeton2,595
08608Trenton786
08561Windsor328

Mercer County, New Jersey Zip Codes by Population (2024)