Hamilton Township is one of twelve townships in Delaware County, Indiana. According to the 2010 census, its population was 12,169 and it contained 18,785 housing units.

Hamilton Township Volunteer Fire Defartment is currently the only working fire department in the township. There are 30+ firefighters that work all for the same cause, to preserve life and property in the township. The department currently operates 9 trucks, ranging from medical and utility trucks, all the way to specialized pumpers.

The Hamilton Township Schoolhouse No. 4 was listed on the National Register of Historic Places in 1904.

According to the 2010 census, the township has a total area of 29.78 square miles (77.1 km), of which 29.7 square miles (77 km) (or 99.73%) is land and 0.07 square miles (0.18 km) (or 0.24%) is water.

• Eaton (south edge)
• Muncie (north edge)

• Anthony
• Royerton

• Union Township (north)
• Niles Township (northeast)
• Delaware Township (east)
• Liberty Township (southeast)
• Center Township (south)
• Harrison Township (west)
• Washington Township (northwest)

• U.S. Route 35
• Indiana State Road 3
• Indiana State Road 28
• Indiana State Road 67

The township contains four cemeteries: Cullen, Gardens of Memory, Stafford and a cemetery discovered in 2021 by the Delaware County Historical Society's Pioneer Cemetery Preservation Committee about 0.5 miles southwest of Anthony.

Historical population

Census	Pop.	Note	%±
1890	1,340		—
1900	1,307		−2.5%
1910	1,263		−3.4%
1920	1,144		−9.4%
1930	1,170		2.3%
1940	1,252		7.0%
1950	1,576		25.9%
1960	2,345		48.8%
1970	4,803		104.8%
1980	7,525		56.7%
1990	7,052		−6.3%
2000	7,163		1.6%
2010	7,206		0.6%
2020	7,169		−0.5%
U.S. Decennial Census

As of the census of 2020, there were 7,169 people, 2,785 households, and 2,131 families living in the township. The population density was 240.7 inhabitants per square mile (92.9/km). There were 2,969 housing units at an average density of 99.70 per square mile (38.5/km). The racial makeup of the township was 92.2% White, 2.2% African American, 1.0% Asian, 0.1% Native American or Alaskan Native, 0.01% Native Hawaiian or Pacific Islander, 0.7% from other races, and 3.7% from two or more races. Hispanic or Latino of any race were 2.1% of the population.

There were 2,785 households, of which 19.0% had children under the age of 18 living with them, 57.1% were married couples living together, 25.7% had a female householder with no husband present, 13.1% had a male householder with no wife present, and 4.1% were non-families. 38.8% of all households were made up of individuals. The average household size was 2.57 and the average family size was 2.64.

19.7% of the population had never been married. 58.3% of residents were married and not separated, 8.4% were widowed, 12.7% were divorced, and 0.9% were separated.

The median age in the township was 44.9. 4.8% of residents were under the age of 5; 19.0% of residents were under the age of 18; 81.0% were age 18 or older; and 24.4% were age 65 or older. 6.3% of the population were veterans.

The most common language spoken at home was English with 97.4% speaking it at home, 1.7% spoke Spanish at home, 0.7% spoke an Asian or Pacific Islander language at home, and 0.2% spoke another Indo-European language at home. 3.7% of the population were foreign born.

The median household income in Hamilton Township was $68,925, 22.7% greater than the median average for the state of Indiana. 6.9% of the population were in poverty, including 8.9% of residents under the age of 18. The poverty rate for the township was 6.0% lower than that of the state. 10.5% of the population were disabled and 3.5% had no healthcare coverage. 27.6% of the population had attained a high school or equivalent degree, 26.0% had attended college but received no degree, 9.3% had attained an Associate's degree or higher, 17.0% had attained a Bachelor's degree or higher, and 15.2% had a graduate or professional degree. 4.9% had no degree. 58.0% of Hamilton Township residents were employed, working a mean of 39.3 hours per week. 184 housing units were vacant at a density of 6.2 per square mile (2.4/km).

• "Hamilton 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