Kilbourne
- County:
- Mason County
- County Seat:
- No
- Area (mi²):
- 0.889
- State:
- Illinois
Kilbourne is a village located in Mason County, Illinois. Kilbourne has a 2026 population of 259. Kilbourne is currently declining at a rate of -0.77% annually and its population has decreased by -3.36% since the most recent census, which recorded a population of 268 in 2020.
The median household income in Kilbourne is $44,107 with a poverty rate of 15.67%. The median age in Kilbourne is 33.8 years: 32.5 years for males, and 33.8 years for females. For every 100 females there are 91.4 males.