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For a complete list of populated places, including small neighborhoods and suburbs, visit HomeTown Locator. The following are the most historically and genealogically relevant populated places in this county: Warren County, New Jersey
|Native American communities|
|Historic African American communities|
- Wikipedia contributors, "Union County, New Jersey," in Wikipedia: the Free Encyclopedia,https://en.wikipedia.org/wiki/Union_County,_New_Jersey#Communities, accessed 20 March 2020.