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 from the 2010 census count of 149,265, which in turn reflected an increase of 5,099 over the 144,166 persons at the 2000 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. The county is part of the North Jersey region of the state. In 2015, the county had a per capita personal income of $55,497, the ninth-highest in New Jersey and ranked 220th of 3,113 counties in the United States. As of 2010 The Bureau of Economic Analysis ranked the county as having the 131st-highest per capita income of the 3,113 counties in the United States.

Founded: June 8, 1753
Named for: Sussex, England
Seat: Newton
Largest municipality: Vernon Township (population and area)
Total: 535.54 sq mi (1,387.04 km²)
Land: 518.66 sq mi (1,343.32 km²)
Water: 16.88 sq mi (43.72 km²), 3.2
Twitter profile: sussexnj
Official Website: https://www.sussex.nj.us/
Wikidata description: county in New Jersey, United States
Wikidata id: Q495998
Wikidata label: Sussex County
Wikidata aliases: Array
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