Union is located in Boone County, KY. The population is 5,357, making Union the 6th largest city in Boone County.
There are 6 public schools in Union with an average Homefacts rating of A. The total crime rate for Union is moderate , and there are 12 registered sex offenders residing in the city. Unemployment in Union is moderate and the median home sales price is $0. Detailed and up-to-date Union property reports are available for any property address.