Lake township
- County:
- Clinton County
- County Seat:
- No
- Area (mi²):
- 29.788
- State:
- Illinois
Lake township is located in Clinton County, Illinois. Lake township has a 2026 population of 819. Lake township is currently growing at a rate of 0.86% annually and its population has increased by 0.12% since the most recent census, which recorded a population of 818 in 2020.
The median household income in Lake township is $73,448 with a poverty rate of 4.23%. The median age in Lake township is 33.6 years: 34.5 years for males, and 32.8 years for females. For every 100 females there are 105.6 males.