Harrison Township is one of seventeen townships in Kosciusko County, Indiana. As of the 2020 census, its population was 3,786 (up from 3,587 at 2010[4]) and it contained 1,569 housing units.
According to the 2010 census, the township has a total area of 42.92 square miles (111.2 km2), of which 41.7 square miles (108 km2) (or 97.16%) is land and 1.22 square miles (3.2 km2) (or 2.84%) is water.[4]