Warren County, New Jersey

Warren County population, land area and income

Warren County had 112,031 residents in the Census Vintage 2024 estimate, on 356.5 square miles of land. It ranks 19th of 21 in New Jersey by population and 9th by land area. That works out to 314.2 people per square mile, 3.3 times the US average of 96.3, and in the top quarter nationally.

The median county-equivalent in New Jersey has 475,515 residents, so Warren County has 24% of the typical county's population.

Its SAIPE 2023 median household income of $98,857 is in the top tenth among 3,143 counties with an estimate.

How Warren County's population changed since 2020

Warren County gained 2,511 residents between the July 2020 and July 2024 estimates, a rise of 2.3%. That ranks 11th of 21 in New Jersey for growth. The median New Jersey county changed by +2.3%, and the state as a whole by +2.5%.

Since the April 2020 estimates base, Warren County recorded 4,138 births and 5,065 deaths, a natural change of -927. Net international migration added +1,236 and net domestic migration, people moving to or from other US counties, came to +2,126. The largest single component was domestic migration, which added 2,126 people.

Where Warren County is

The Census internal point of Warren County is at 40.853500, -75.009500. It sits in UTM zone 18N. The map shades New Jersey's 21 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Warren County outlined. Dots are towns of 1,000+ people with residents in it.

Towns in Warren County

5 incorporated places of 1,000+ people have residents in Warren County, 37,852 people together, or 34% of the county. Each figure counts only the part of the town inside Warren County; towns marked "part" extend into another county. The largest is Phillipsburg with 15,393.

Counties bordering Warren County

The Census 2024 county adjacency file lists 6 neighbors for Warren County, including 3 across a state line. The most populous is Bucks County, PA, with 650,131 residents. Distances run between Census internal points in a straight line.

• PA

  Bucks County, PA

  650,131 people

  36 mi S

• Morris County

  523,053 people

  24 mi E

• PA

  Northampton County, PA

  322,989 people

  17 mi WSW

• PA

  Monroe County, PA

  166,523 people

  22 mi NW

• Sussex County

  147,444 people

  26 mi NE

• Hunterdon County

  131,708 people

  21 mi SSE

Distance to Trenton and the nearest big city

Trenton is 45.7 miles SSE of Warren County's internal point in a straight line. The nearest place of 100,000 or more is Allentown, PA (population 127,138), 30.4 miles away. The nearest place of 10,000 or more is Hackettstown, NJ (population 10,182), 9.6 miles away.

Warren County FIPS code

The FIPS code of Warren County is 34041: state code 34 for New Jersey plus county code 041. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $98,857.