Harrison Township is one of twelve townships in Delaware County, Indiana. According to the 2020 census, its population was 3,463 and it contained 1,462 housing units.

The Job Garner-Jacob W. Miller House was listed on the National Register of Historic Places in 1986.

According to the 2010 census, the township has a total area of 42.42 square miles (109.9 km), of which 42.3 square miles (110 km) (or 99.72%) is land and 0.12 square miles (0.31 km) (or 0.28%) is water. Emerald Lake is in this township.

• Muncie, northwest edge

• Bethel

• Washington Township (north)
• Union Township (northeast)
• Hamilton Township (east)
• Center Township (southeast)
• Mount Pleasant Township (south)
• Richland Township, Madison County (southwest)
• Monroe Township, Madison County (west)
• Van Buren Township, Madison County (northwest)

• Interstate 69
• U.S. Route 35
• State Road 28
• State Road 332

The township contains three cemeteries, Hinton and Nottingham.

Historical population

Census	Pop.	Note	%±
1890	2,041		—
1900	2,106		3.2%
1910	1,782		−15.4%
1920	1,539		−13.6%
1930	1,513		−1.7%
1940	1,519		0.4%
1950	1,600		5.3%
1960	1,927		20.4%
1970	2,983		54.8%
1980	3,585		20.2%
1990	3,336		−6.9%
2000	3,425		2.7%
2010	3,327		−2.9%
2020	3,463		4.1%
U.S. Decennial Census

As of the census of 2020, there were 3,463 people, 1,312 households, and 646 families living in the township. The population density was 81.63 inhabitants per square mile (31.5/km). There were 1,462 housing units at an average density of 34.46 per square mile (13.3/km). The racial makeup of the township was 94.4% White, 9.8% African American, 6.4% Asian, 7.2% from other races, and 3.1% from two or more races. Hispanic or Latino of any race were 2.1% of the population.

There were 1,312 households, of which 28.6% had children under the age of 18 living with them, 49.2% were married couples living together, 9.1% had a female householder with no husband present, 3.8% had a male householder with no wife present, and 37.9% were non-families. 12.9% of all households were made up of individuals. The average household size was 2.64 and the average family size was 3.18.

21.5% of the population had never been married. 59.2% of residents were married and not separated, 9.3% were widowed, 10.0% were divorced, and 0.0% were separated.

The median age in the township was 38.9. 12.1% of residents were under the age of 5; 28.6% of residents were under the age of 18; 71.4% were age 18 or older; and 24.8% were age 65 or older. 6.4% of the population were veterans.

The most common language spoken at home was English with 98.4% speaking it at home, 0.5% spoke Spanish at home, 0.9% spoke another Indo-European language at home, and 0.2% spoke some other language. 1.4% of the population were foreign born.

The median household income in Harrison Township was $71,164, 26.7% greater than the median average for the state of Indiana. 13.2% of the population were in poverty, including 21.0% of residents under the age of 18. The poverty rate for the township was 0.3% higher than that of the state. 21.3% of the population were disabled and 6.4% had no healthcare coverage. 37.1% of the population had attained a high school or equivalent degree, 21.5% had attended college but received no degree, 9.9% had attained an Associate's degree or higher, 11.6% had attained a Bachelor's degree or higher, and 11.0% had a graduate or professional degree. 30.4% had no degree. 49.6% of Harrison Township residents were employed, working a mean of 38.4 hours per week. 150 housing units were vacant at a density of 3.5 per square mile (1.4/km).

• "Harrison Township, Delaware County, Indiana". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved September 24, 2009.
• United States Census Bureau cartographic boundary files

• Indiana Township Association
• United Township Association of Indiana