Union County, New Jersey is the 15th-most densely populated county in the United States, according to the 2010 Census, with a population density of 4,955 people per square mile (excluding water). Founded in 1857, it was also the last of New Jersey’s 21 counties to be established. Some of the more populace cities include Linden, Plainfield, Union, and the county seat, Elizabeth. Union County is also known for its love and appreciation of history, with many historical societies in the area, as well as the annual “Four Centuries in a Weekend” festival. Here are our Union County, NJ listings:

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