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
0854048,513Princeton
0861839,047Trenton
0861032,324Trenton
0861131,660Trenton
0864831,626Lawrence Township
0852029,296Hightstown
0863823,804Trenton
0861923,446Trenton
0855020,954Princeton Junction
0869019,959Trenton
0869116,935Robbinsville
0862913,075Trenton
0853412,990Pennington
0862012,913Trenton
0860912,799Trenton
086289,107Trenton
085254,554Hopewell
085444,504Princeton
085603,689Titusville
085422,595Princeton
08608786Trenton
08561328Windsor

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