Big Spring township
- County:
- Shelby County
- County Seat:
- No
- Area (mi²):
- 29.345
- State:
- Illinois
Big Spring township is located in Shelby County, Illinois. Big Spring township has a 2026 population of 606. Big Spring township is currently growing at a rate of 0.17% annually but its population has decreased by -1.3% since the most recent census, which recorded a population of 614 in 2020.
The median household income in Big Spring township is $86,367 with a poverty rate of 0%. The median age in Big Spring township is 57.2 years: 58.7 years for males, and 53.6 years for females. For every 100 females there are 88.0 males.