
Fillmore
- County:
- Montgomery County
- County Seat:
- No
- Area (mi²):
- 0.664
- State:
- Illinois
Fillmore is a village located in Montgomery County, Illinois. Fillmore has a 2025 population of 295. Fillmore is currently declining at a rate of -0.34% annually and its population has decreased by -2.32% since the most recent census, which recorded a population of 302 in 2020.
The average household income in Fillmore is $56,972 with a poverty rate of 8.63%. The median age in Fillmore is 53.8 years: 53.3 years for males, and 54.5 years for females.