Kilbourne township
- County:
- Mason County
- County Seat:
- No
- Area (mi²):
- 40.092
- State:
- Illinois
Kilbourne township is located in Mason County, Illinois. Kilbourne township has a 2026 population of 454. Kilbourne township is currently declining at a rate of -0.66% annually and its population has decreased by -3.61% since the most recent census, which recorded a population of 471 in 2020.
The median household income in Kilbourne township is $52,083 with a poverty rate of 10.38%. The median age in Kilbourne township is 34.3 years: 40.6 years for males, and 22.9 years for females. For every 100 females there are 90.6 males.