As of the 2020 census, its population was 2,353 (down from 2,640 at 2010[4]) and it contained 1,155 housing units.

[2] The township was named after William Henry Harrison, hero of the Battle of Tippecanoe, former governor of the Indiana Territory, and ninth President of the United States.

[4] Lake Blue Water and the Godfrey Reserve are in this township.

The Salamonie River runs through the township's northeast corner.

The township contains at least eight cemeteries: Brookside, Independent Order of Odd Fellows, North Twibell, Penrod, Pleasantdale, South Twibell, St Margaret's Roman Catholic, and Woodlawn.