Bell Plain township
- County:
- Marshall County
- County Seat:
- No
- Area (mi²):
- 36.793
- State:
- Illinois
Bell Plain township is located in Marshall County, Illinois. Bell Plain township has a 2026 population of 315. Bell Plain township is currently declining at a rate of -0.32% annually and its population has decreased by -0.94% since the most recent census, which recorded a population of 318 in 2020.
The median household income in Bell Plain township is $53,750 with a poverty rate of 7.73%. The median age in Bell Plain township is 57.2 years: 59.2 years for males, and 57.1 years for females. For every 100 females there are 107.0 males.