
Sumpter township
- County:
- Cumberland County
- County Seat:
- No
- Area (mi²):
- 45.69
- State:
- Illinois
Sumpter township is located in Cumberland County, Illinois. Sumpter township has a 2025 population of 1,969. Sumpter township is currently declining at a rate of -0.46% annually and its population has decreased by -2.52% since the most recent census, which recorded a population of 2,020 in 2020.
The average household income in Sumpter township is $82,413 with a poverty rate of 10.23%. The median age in Sumpter township is 41.3 years: 37 years for males, and 47.2 years for females.