
Hennepin township
- County:
- Putnam County
- County Seat:
- No
- Area (mi²):
- 41.389
- State:
- Illinois
Hennepin township is located in Putnam County, Illinois. Hennepin township has a 2025 population of 1,231. Hennepin township is currently growing at a rate of 0.33% annually but its population has decreased by -0.4% since the most recent census, which recorded a population of 1,236 in 2020.
The average household income in Hennepin township is $103,514 with a poverty rate of 11.62%. The median age in Hennepin township is 40.1 years: 40.8 years for males, and 39.8 years for females.