Union County
Union County is a county in the northern-central part of the U.S. state of New Jersey. As of the 2020 United States census, the county was the state's seventh-most-populous county with a population of 575,345, its highest decennial count ever and an increase of 38,846 (+7.2%) from the 2010 census count of 536,499. The United States Census Bureau's Population Estimates Program estimated a 2025 population of 601,863, an increase of 26,518 (+4.6%) from the 2020 decennial census. Its county seat is Elizabeth, which is also the most populous municipality in the county, with a 2020 census population of 137,298, and the largest by area, covering 13.46 square miles (34.9 km2). The county is part of the Central Jersey region of the state.
Governance bodies
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Cities and towns 13
- Borough of Fanwood pop. 7,699
- Borough of Garwood pop. 4,393
- Borough of Kenilworth pop. 8,335
- Borough of Mountainside pop. 7,014
- Borough of New Providence pop. 13,617
- Borough of Roselle pop. 22,432
- Borough of Roselle Park pop. 13,911
- City of Elizabeth pop. 135,407
- City of Linden pop. 43,594
- City of Plainfield pop. 54,936
- City of Rahway pop. 29,911
- City of Summit pop. 22,526
- Town of Westfield pop. 30,754
Townships 8
Reference data (Census of Governments 2022)
- Census ID (PID6)
- 194928
- FIPS state
- 34
- FIPS county
- 039
- FIPS place
- 99039
- Census record name
- COUNTY OF UNION
- Mailing address
- 10 ELIZABETHTOWN PLZ, ELIZABETH 07207