Mercer County, New Jersey

Mercer County is a county in New Jersey with an estimated population of 381,671 in 2023. 5 cities, towns and Census places in it are indexed here.

Largest places in Mercer County

About Mercer County

Mercer County is one of the counties of New Jersey. County governments in New Jersey handle local services such as courts, property records and elections; cities and towns inside the county run their own municipal services. Population figures come from the Census Bureau's Vintage 2023 estimates, which are updated annually.