Clay Township is one of nine townships in Spencer County, Indiana. As of the 2010 census, its population was 2,801 and it contained 1,185 housing units.HistoryClay Township was the last township of Spencer County to be organized, because the rolling hills and relatively poor soil attracted fewer settlers than other areas in the vicinity.GeographyAccording to the 2010 census, the township has a total area of, of which is land and is water.Cities and townsSanta ClausUnincorperated townsBuffalovilleClay CityKennedyKerchevalLamarLiberal