Harrison Township, Knox County, IndianaHarrison Township is one of ten townships in Knox County, Indiana. As of the 2020 census, its population was 1,921 and it contained 867 housing units.HistoryHarrison Township was founded in 1801. It was named for General William Henry Harrison, an American military officer and ninth President of the United States.GeographyAccording to the 2010 census, the township has a total area of, of which is land and is water.