Cornwall township
- County:
- Henry County
- County Seat:
- No
- Area (mi²):
- 35.586
- State:
- Illinois
Cornwall township is located in Henry County, Illinois. Cornwall township has a 2026 population of 253. Cornwall township is currently declining at a rate of -0.39% annually and its population has decreased by -1.94% since the most recent census, which recorded a population of 258 in 2020.
The median household income in Cornwall township is $75,000 with a poverty rate of 4.18%. The median age in Cornwall township is 43.3 years: 41.7 years for males, and 43.7 years for females. For every 100 females there are 89.7 males.