
Mendon
- County:
- Adams County
- County Seat:
- No
- Area (mi²):
- 0.857
- State:
- Illinois
Mendon is a village located in Adams County, Illinois. Mendon has a 2025 population of 839. Mendon is currently declining at a rate of -0.71% annually and its population has decreased by -3.45% since the most recent census, which recorded a population of 869 in 2020.
The average household income in Mendon is $71,522 with a poverty rate of 13.9%. The median age in Mendon is 37.2 years: 36.5 years for males, and 37.2 years for females.