New Jersey has 21 counties with a total of 565 municipalities, as of 2015. In the state of New Jersey, a county serves as a local level of government smaller than the state and larger than a municipality.Continue Reading
Ocean County, with the county seat of Toms River, is the largest county in the state in terms of area with 916 square miles, while Union County, with the county seat of Elizabeth, is the smallest with 103 square miles. Union County is also the newest county in the state, created in 1857.
The county with the largest population, according to the last census, is Bergen County. Its county seat is Hackensack. Salem County is the smallest in population. Its county seat is Salem.Learn more about The Northeast