Otter Creek township
- County:
- Jersey County
- County Seat:
- No
- Area (mi²):
- 36.481
- State:
- Illinois
Otter Creek township is located in Jersey County, Illinois. Otter Creek township has a 2026 population of 847. Otter Creek township is currently declining at a rate of -0.59% annually and its population has decreased by -3.09% since the most recent census, which recorded a population of 874 in 2020.
The median household income in Otter Creek township is $63,125 with a poverty rate of 12.56%. The median age in Otter Creek township is 53 years: 52.8 years for males, and 57.1 years for females. For every 100 females there are 111.6 males.