Sussex County
Sussex County is the northernmost county in the U.S. state of New Jersey. Its county seat is Newton. It is part of the New York metropolitan area and is part of New Jersey's Skylands Region. As of the 2020 census, the county was the state's 17th-most-populous county, with a population of 144,221, a decrease of 5,044 (−3.4%) from the 2010 census count of 149,265, which in turn reflected an increase of 5,099 (+3.5%) over the 144,166 persons at the 2000 census. The United States Census Bureau's Population Estimates Program estimated a 2025 population of 148,063, an increase of 3,842 (+2.7%) from the 2020 decennial census. Based on 2020 census data, Vernon Township was the county's largest in both population and area, with a population of 22,358 and covering an area of 70.59 square miles (182.8 km2). The county is part of the North Jersey region of the state.
Governance bodies
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Cities and towns 9
Townships 15
- Township of Andover pop. 6,172
- Township of Byram pop. 8,061
- Township of Frankford pop. 5,362
- Township of Fredon pop. 3,257
- Township of Green pop. 3,651
- Township of Hampton pop. 4,914
- Township of Hardyston pop. 8,225
- Township of Lafayette pop. 2,381
- Township of Montague pop. 3,803
- Township of Sandyston pop. 1,987
- Township of Sparta pop. 19,976
- Township of Stillwater pop. 4,020
- Township of Vernon pop. 22,446
- Township of Walpack pop. 5
- Township of Wantage pop. 10,866
Reference data (Census of Governments 2022)
- Census ID (PID6)
- 109049
- FIPS state
- 34
- FIPS county
- 037
- FIPS place
- 99037
- Census record name
- COUNTY OF SUSSEX
- Mailing address
- 1 SPRING ST, NEWTON 07860