Union County:

As of the 2020 United States census.

 The county was the state's seventh-most-populous county with a population of 575,345, its highest decennial count ever, and ...Union County consists of 21 distinct municipalities that are near NYC and offer easy access to Newark Liberty International Airport. Union County is the name of seventeen counties in the United States: Union County, Arkansas. Union County, Florida. Union County, Georgia. The 21 municipalities of Union County are represented by four legislative districts. Elizabeth, Kenilworth, Roselle, and Union Township.

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Berkeley Heights, Clark, Cranford, Elizabeth, Fanwood, Garwood, Hillside, Kenilworth, Linden, Mountainside, New Providence, Plainfield, Rahway, Roselle, Roselle Park, Scotch Plains, Springfield, Summit, Union Twp., Westfield, Winfield