Template:Wp-Union County, New Jersey

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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's population was 575,345, making it the seventh-most populous of New Jersey's 21 counties. Its county seat is Elizabeth.

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. 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. A study by Forbes.com determined that Union County pays the second-highest property taxes of all U.S. counties, based on 2007 data.

With a population density of 4,955 people per square mile (water excluded), 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).