Decker township
- County:
- Richland County
- County Seat:
- No
- Area (mi²):
- 35.239
- State:
- Illinois
Decker township is located in Richland County, Illinois. Decker township has a 2026 population of 405. Decker township is currently declining at a rate of -0.98% annually and its population has decreased by -2.41% since the most recent census, which recorded a population of 415 in 2020.
The median household income in Decker township is $91,750 with a poverty rate of 0%. The median age in Decker township is 63.7 years: 66.5 years for males, and 63.3 years for females. For every 100 females there are 82.9 males.