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Union county, New Jersey, USGenWeb | genealogy resources for Union county, New Jersey, part of USGenWeb In 1857, Union County became the last New Jersey county to be created. Ironically, its boundaries were essentially the same as the original 1664 Elizabethtown Purchase, the first English settlement in the state. The newly formed county consisted of the City of Elizabeth and the Townships of Springfield, Westfield, Rahway, Union, New Providence, and Plainfield,…]