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
Population
City
854048,513Princeton
861839,047Trenton
861032,324Trenton
861131,660Trenton
864831,626Trenton
852029,296Hightstown
863823,804Trenton
861923,446Trenton
855020,954Princeton Junction
869019,959Trenton
869116,935Trenton
862913,075Trenton
853412,990Pennington
862012,913Trenton
860912,799Trenton
86289,107Trenton
85254,554Hopewell
85444,504Princeton
85603,689Titusville
85422,595Princeton
8608786Trenton
8561328Windsor
showing: 22 rows

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