Bath Township, Franklin County, Indiana  Bath Township is one of 13 townships in Franklin County, Indiana. As of the 2010 census, its population was 369. The name of Bath is probably derived from local mineral springs said to hold medicinal qualities. According to the 2010 census, the township has a total area of , of which (or 99.84%) is land and (or 0.16%) is water. (This list is based on USGS data and may include former settlements.) The township contains one cemetery, Bethlehem.