Flat Rock
- County:
- Crawford County
- County Seat:
- No
- Area (mi²):
- 0.856
- State:
- Illinois
Flat Rock is a village located in Crawford County, Illinois. Flat Rock has a 2026 population of 319. Flat Rock is currently declining at a rate of 0% annually and its population has decreased by -1.54% since the most recent census, which recorded a population of 324 in 2020.
The median household income in Flat Rock is $51,667 with a poverty rate of 11.94%. The median age in Flat Rock is 41.5 years: 43.5 years for males, and 40.7 years for females. For every 100 females there are 93.7 males.