Warren County
Sign in to savecounty in New Jersey, United States
Key facts
- Country
- United States
- State
- New Jersey
- Founded
- November 20, 1824
- Named after
- Joseph Warren
- Seat
- Belvidere
- Largest municipality
- Phillipsburg (population), Hardwick Township (area)
- Commissioner director
- Lori Ciesla ( R , term ends December 31, 2024)
- Total
- 362.65 sq mi (939.3 km )
- Land
- 356.54 sq mi (923.4 km )
- Water
- 6.11 sq mi (15.8 km ) 1.7%
- Estimate 2025
- 112,953
- Density
- 307.49/sq mi (118.72/km )
- Time zone
- UTC−5 ( Eastern )
- Summer dst
- UTC−4 ( EDT )
- Congressional district
- 7th
- Website
- warrencountynj .gov
via Wikipedia infobox
Article
Warren County is a county located in the U.S. state of New Jersey. According to the 2020 census, the county was the state's 19th-most populous county, with a population of 109,632, its highest decennial count ever and an increase of 940 (+0.9%) from the 2010 census count of 108,692, which in turn reflected an increase of 6,255 (+6.1%) from 102,437 counted at the 2000 census. The United States Census Bureau's Population Estimates Program estimated a 2025 population of 112,953, an increase of 3,321 (+3.0%) from the 2020 decennial census. The county is part of the North Jersey region of the state.
The county borders the Delaware River and Easton, Pennsylvania in the Lehigh Valley to its west, the New York City metropolitan area to its east, the Poconos to its northwest, and Hunterdon County to its south.