
Salem township
- County:
- Marion County
- County Seat:
- No
- Area (mi²):
- 35.78
- State:
- Illinois
Salem township is located in Marion County, Illinois. Salem township has a 2025 population of 909. Salem township is currently declining at a rate of -0.33% annually and its population has decreased by -3.5% since the most recent census, which recorded a population of 942 in 2020.
The average household income in Salem township is $79,300 with a poverty rate of 4.04%. The median age in Salem township is 46.4 years: 42.6 years for males, and 47.7 years for females.