Warren County is a county located in the U.S. state of New Jersey, in the United States. As of the 2020 United States census, the county's population was 109,632, representing an increase of 940 (0.9%) from the 108,692 residents counted at the 2010 U.S. Census. It borders the Delaware River and Easton, Pennsylvania in the Lehigh Valley to its west. It shares a border with the New York City metropolitan area to its east, with its northwestern section bordering The Poconos. The most populous place is Phillipsburg, with 14,950 residents at the time of the 2010 Census, while Hardwick Township had both the largest area 37.92 square miles (98.2 km2) and the fewest people (1,696). Its county seat is Belvidere.
Somerset County is a county located in the north-central part of the U.S. state of New Jersey. As of the 2020 United States Census, the county's population was 345,361, an increase of 21,917 (6.8%) from the 323,444 counted at the 2010 U.S Census, making it the 13th most populous of the state's 21 counties. Somerset County constitutes part of the New York Metropolitan Area. Its county seat is Somerville. The most populous place in the county was Franklin Township, with 62,300 residents at the time of the 2010 Census, while Hillsborough Township, with 55.00 square miles (142.4 km2), covered the largest total area of any municipality.
Warren Township is a township in Somerset County, New Jersey, United States. The township is a bedroom suburb of New York City in the much larger New York metropolitan area, located within the Raritan Valley region. As of the 2010 United States Census, the township's population was 15,311, reflecting an increase of 1,052 (+7.4%) from the 14,259 counted in the 2000 Census, which had in turn increased by 3,429 (+31.7%) from the 10,830 counted in the 1990 Census. Warren is situated in northeastern Somerset County bordering both Morris and Union counties.
Allamuchy Township is a township in Warren County, New Jersey, United States. As of the 2010 United States Census, the township's population was 4,323, reflecting an increase of 446 (+11.5%) from the 3,877 counted in the 2000 Census, which had in turn increased by 393 (+11.3%) from the 3,484 counted in the 1990 Census.
Alpha is a borough in Warren County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 2,369, reflecting a decline of 113 (-4.6%) from the 2,482 counted in the 2000 Census, which had in turn declined by 48 (-1.9%) from the 2,530 counted in the 1990 Census.
Belvidere is a town in Warren County, New Jersey, in the United States. As of the 2010 United States Census, the town's population was 2,681, reflecting a decline of 90 (-3.2%) from the 2,771 counted in the 2000 Census, which had in turn increased by 102 (+3.8%) from the 2,669 counted in the 1990 Census. It is the county seat of Warren County.
Blairstown is a township in Warren County, New Jersey, United States. As of the 2010 United States Census, the township's population was 5,967 reflecting an increase of 220 (+3.8%) from the 5,747 counted in the 2000 Census, which had in turn increased by 416 (+7.8%) from the 5,331 counted in the 1990 Census.
Greenwich Township is a township in Warren County, New Jersey, United States. As of the 2010 United States Census, the township's population was 5,712, reflecting an increase of 1,347 (+30.9%) from the 4,365 counted in the 2000 Census, which had in turn increased by 2,466 (+129.9%) from the 1,899 counted in the 1990 Census.
Hackettstown is a town in Warren County, in the state of New Jersey, United States. As of the 2010 United States Census, the town's population was 9,724. reflecting a decline of 679 (-6.5%) from the 10,403 counted in the 2000 Census.
Harmony Township is a township located in Warren County, New Jersey, United States. As of the 2010 United States Census, the township's population was 2,667, reflecting a decline of 62 (-2.3%) from the 2,729 counted in the 2000 Census, which had in turn increased by 76 (+2.9%) from the 2,653 counted in the 1990 Census.
Hope Township is a township in Warren County, New Jersey, United States. As of the 2010 United States Census, the township's population was 1,952, reflecting an increase of 61 (+3.2%) from the 1,891 counted in the 2000 Census, which had in turn increased by 172 (+10.0%) from the 1,719 counted in the 1990 Census. The 2010 Census population marked the first decennial census in which the township's population exceeded the 1,903 recorded in the 1840 Census, the first recorded population after the township was formed.
Liberty Township is a township in Warren County, New Jersey, United States. As of the 2010 United States Census, the township's population was 2,942, reflecting an increase of 177 (+6.4%) from the 2,765 counted in the 2000 Census, which had in turn increased by 272 (+10.9%) from the 2,493 counted in the 1990 Census.
Lopatcong Township is a township in Warren County, New Jersey, United States. As of the 2010 United States Census, the township's population was 8,014, reflecting an increase of 2,249 (+39.0%) from the 5,765 counted in the 2000 Census, which had in turn increased by 713 (+14.1%) from the 5,052 counted in the 1990 Census.
Phillipsburg is a town located along the Delaware River in Warren County, New Jersey, United States. It is located across the river from Easton, Pennsylvania.
Pohatcong Township is a township in Warren County, New Jersey, United States. As of the 2010 United States Census, the township's population was 3,339, reflecting a decline of 77 (-2.3%) from the 3,416 counted in the 2000 Census, which had in turn declined by 175 (-4.9%) from the 3,591 counted in the 1990 Census.
Washington is a borough in Warren County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 6,461, reflecting a decline of 251 (-3.7%) from the 6,712 counted in the 2000 Census, which had in turn increased by 238 (+3.7%) from the 6,474 counted in the 1990 Census.
Washington Township is a township in Warren County, New Jersey, United States. As of the 2010 United States Census, the township's population was 6,651, reflecting an increase of 403 (+6.5%) from the 6,248 counted in the 2000 Census, which had in turn increased by 881 (+16.4%) from the 5,367 counted in the 1990 Census.
White Township is a township in Warren County, New Jersey, United States. As of the 2010 United States Census, the township's population was 4,882, reflecting an increase of 637 (+15.0%) from the 4,245 counted in the 2000 Census, which had in turn increased by 642 (+17.8%) from the 3,603 counted in the 1990 Census.
Finesville is an unincorporated community and census-designated place (CDP) located within Pohatcong Township in Warren County, New Jersey, United States, that was defined as part of the 2010 United States Census. As of the 2010 Census, the CDP's population was 175.
Hughesville is an unincorporated community located along the border of Holland Township in Hunterdon County and Pohatcong Township in Warren County, New Jersey, United States. The community is named after Hugh Hughes, a lawyer from Philadelphia, who built a forge here during the 18th century.
United States 
New Jersey 
