Spring township
- County:
- Boone County
- County Seat:
- No
- Area (mi²):
- 36.04
- State:
- Illinois
Spring township is located in Boone County, Illinois. Spring township has a 2026 population of 857. Spring township is currently growing at a rate of 0.12% annually but its population has decreased by -1.27% since the most recent census, which recorded a population of 868 in 2020.
The median household income in Spring township is $135,595 with a poverty rate of 16.35%. The median age in Spring township is 37.3 years: 38.8 years for males, and 36.5 years for females. For every 100 females there are 106.3 males.