Union County | |
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![]() Downtown Westfield in July 2005 | |
![]() Location within the U.S. state of New Jersey | |
![]() New Jersey's location within the U.S. | |
Coordinates: 40°39′N 74°17′W / 40.65°N 74.29°W | |
Country | ![]() |
State | ![]() |
Founded | 1857[1] |
Named for | Union threatened by slavery dispute[2] |
Seat | Elizabeth[3] |
Largest city | Elizabeth (population and area) |
Government | |
• Commission Chair | Sergio Granados (D, term ends December 31, 2025) |
Area | |
• Total | 105.41 sq mi (273.0 km2) |
• Land | 102.77 sq mi (266.2 km2) |
• Water | 2.64 sq mi (6.8 km2) 2.5% |
Population | |
• Total | 575,345 |
• Estimate | 572,726 ![]() |
• Density | 5,500/sq mi (2,100/km2) |
Congressional districts | 7th, 8th, 10th, 12th |
Website | www |
Union County is a county in the northern part of the U.S. state of New Jersey. As of the 2020 United States census, the county was the state's seventh-most-populous county[8] with a population of 575,345,[5][6] its highest decennial count ever and an increase of 38,846 (+7.2%) from the 2010 census count of 536,499.[9] Its county seat is Elizabeth,[3] which is also the most populous municipality in the county, with a 2020 census population of 137,298,[6] and the largest by area, covering 13.46 square miles (34.9 km2).[10] The county serves as a transition point between the Central Jersey and North Jersey regions of the state.[11][12]
In 2015, the county had a per capita personal income of $60,089, the seventh-highest in New Jersey and ranked 152nd of 3,113 counties in the United States.[13][14] The Bureau of Economic Analysis ranked the county as having the 119th-highest per capita income of all 3,113 counties in the United States (and the eighth-highest in New Jersey) in 2009.[15] A study by Forbes.com determined that Union County residents pay the second-highest property taxes of all U.S. counties, based on 2007 data.[16]
With a population density of 4,955 inhabitants per square mile (1,913/km2) in 2000, Union County was the 15th-most densely populated county in the United States as of the 2010 Census, and third-densest in New Jersey, behind Hudson County (ranked 6th nationwide at 9,754 per square mile) and Essex County (ranked 11th at 6,126).[17][18]
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