
Casey township
- County:
- Clark County
- County Seat:
- No
- Area (mi²):
- 36.223
- State:
- Illinois
Casey township is located in Clark County, Illinois. Casey township has a 2025 population of 3,354. Casey township is currently declining at a rate of -0.47% annually and its population has decreased by -3.2% since the most recent census, which recorded a population of 3,465 in 2020.
The average household income in Casey township is $74,842 with a poverty rate of 11.69%. The median age in Casey township is 39.1 years: 37.6 years for males, and 40.1 years for females.