Cooper township
- County:
- Sangamon County
- County Seat:
- No
- Area (mi²):
- 28.536
- State:
- Illinois
Cooper township is located in Sangamon County, Illinois. Cooper township has a 2026 population of 866. Cooper township is currently declining at a rate of -0.12% annually and its population has decreased by -1.48% since the most recent census, which recorded a population of 879 in 2020.
The median household income in Cooper township is $136,354 with a poverty rate of 0%. The median age in Cooper township is 45.5 years: 39.9 years for males, and 47.5 years for females. For every 100 females there are 125.1 males.