Barnett township
- County:
- De Witt County
- County Seat:
- No
- Area (mi²):
- 37.379
- State:
- Illinois
Barnett township is located in De Witt County, Illinois. Barnett township has a 2026 population of 364. Barnett township is currently declining at a rate of 0% annually and its population has decreased by -0.55% since the most recent census, which recorded a population of 366 in 2020.
The median household income in Barnett township is $107,188 with a poverty rate of 5.57%. The median age in Barnett township is 52.6 years: 58.3 years for males, and 47.6 years for females. For every 100 females there are 77.5 males.