In 2021, Union County, NJ had a population of 572k people with a median age of 39 and a median household income of $87,369. Between 2020 and 2021 the population of Union County, NJ grew from 555,208 to 571,963, a 3.02% increase and its median household income grew from $82,644 to $87,369, a 5.72% increase.
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