Middlesex County, New Jersey
Middlesex County is a county in New Jersey with an estimated population of 863,623 in 2023. 15 cities, towns and Census places in it are indexed here.
Largest places in Middlesex County
New Brunswick 55,846Perth Amboy 55,249Sayreville 45,496Carteret 25,281South Plainfield 24,131South River 15,931Metuchen 14,977Highland Park 14,959Middlesex 14,461South Amboy 10,237Dunellen 8,176Spotswood 8,078Milltown 6,968Jamesburg 5,735Helmetta 2,437
About Middlesex County
Middlesex 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.