Union Township is one of twelve townships in Clark County, Indiana, United States. As of the 2010 census, its population was 3,507 and it contained 1,415 housing units.
Union Township was organized in 1858. Its name was given from the fact that this township was created through the merger or "union" of land given by three neighboring townships.
According to the 2010 census, the township has a total area of , of which (or 98.91%) is land and (or 1.09%) is water.
(This list is based on USGS data and may include former settlements.)
The township contains three cemeteries: Black and White (aka Weir or Wilson), Bowery, Ebenezer Methodist Episcopal Church.