Newmansville township
- County:
- Cass County
- County Seat:
- No
- Area (mi²):
- 17.787
- State:
- Illinois
Newmansville township is located in Cass County, Illinois. Newmansville township has a 2026 population of 65. Newmansville township is currently declining at a rate of 0% annually and its population has decreased by -1.52% since the most recent census, which recorded a population of 66 in 2020.
The median age in Newmansville township is 18.3 years: 37.3 years for males, and 4.3 years for females. For every 100 females there are 43.3 males.