Union is a city in Boone County, Kentucky, United States. The population was 5,379 in the 2010 Census. Previously a small rural community, the city began to experience rapid residential development in the 1990's and 2000's and has now become one of Cincinnati's more affluent suburbs.
The City of Union grew from a small settlement that may have existed as early as the late 18th century. However by the early 19th century, much of the land that now lies in Union was owned by the Fowler family, and Benjamin Piatt Fowler built his in what is now the northern area of the city c. 1817.
It has been recorded that Union was established as early as 1833, but existing documentation shows that Union was officially incorporated as a city in 1838. Why the name Union was chosen no one actually knows, but the story goes that since it was a connection point between Florence, KY and Big Bone Lick, "Union" seemed somehow appropriate. Salt was manufactured at Big Bone Lick during the early 19th century, and then brought to Union for distribution to other area settlements.