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Neighborhood Guides > Union City
 Union City is a city in Hudson County, New Jersey, United States. As of the United States 2000 Census, the city had a total population of 67,088, living on a land area of 3.28 km² (1.27 sq mi). It is the most densely populated city in the United States, with a density of 52,977.8 per square mile.
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