Tonti township
- County:
- Marion County
- County Seat:
- No
- Area (mi²):
- 35.479
- State:
- Illinois
Tonti township is located in Marion County, Illinois. Tonti township has a 2026 population of 985. Tonti township is currently declining at a rate of -0.51% annually and its population has decreased by -3.15% since the most recent census, which recorded a population of 1,017 in 2020.
The median household income in Tonti township is $70,130 with a poverty rate of 14.09%. The median age in Tonti township is 50.2 years: 46.3 years for males, and 56.1 years for females. For every 100 females there are 94.7 males.