
Monroe
- County:
- Butler County
- County Seat:
- No
- Area (mi²):
- 15.781
- State:
- Ohio
Monroe is a city located in Butler County, Ohio. Monroe has a 2025 population of 15,693. Monroe is currently growing at a rate of 0.3% annually and its population has increased by 1.51% since the most recent census, which recorded a population of 15,460 in 2020.
The average household income in Monroe is $113,194 with a poverty rate of 3.85%. The median age in Monroe is 36.3 years: 34.2 years for males, and 38 years for females.