County · New Jersey

Somerset County

Somerset County is a county located in the north-central part of the U.S. state of New Jersey. As of the 2020 census, the county was the state's 13th-most-populous county, with a population of 345,361, its highest decennial count ever and an increase of 21,917 (+6.8%) from the 2010 census count of 323,444. The United States Census Bureau's Population Estimates Program estimated a 2025 population of 356,486, an increase of 11,125 (+3.2%) from the 2020 decennial census. Somerset County constitutes part of the New York metropolitan area. Its county seat is Somerville. The most populous place in the county was Franklin Township, with 68,364 residents at the time of the 2020 census, while Hillsborough Township, with 55.00 square miles (142.4 km2), covered the largest total area of any municipality. The county is part of the Central Jersey region of the state.

Governance bodies

Board of County Commissioners Primary
governing council

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Cities and towns 12

Townships 9

Reference data (Census of Governments 2022)

Census ID (PID6): 183766
FIPS state: 34
FIPS county: 035
FIPS place: 99035
Census record name: COUNTY OF SOMERSET
Mailing address: PO BOX 3000, SOMERVILLE 08876