Harrison Township is located in Winnebago County, Illinois. As of the 2010 census, its population was 670 and it contained 273 housing units.

Geography

According to the 2010 census, the township has a total area of 24.73 square miles (64.1 km), of which 24.61 square miles (63.7 km) (or 99.51%) is land and 0.12 square miles (0.31 km) (or 0.49%) is water.

Demographics

Historical population

Census	Pop.	Note	%±
2016 (est.)	651
U.S. Decennial Census