Monroe is located in Butler County, Ohio. Monroe has a 2025 population of 607 . Monroe is currently growing at a rate of 0.33% annually and its population has increased by 0.33% since the most recent census, which recorded a population of 605 in 2020.
The median age in Monroe is 52.4 years: 28 years for males, and 55.6 years for females. For every 100 females there are 146.6 males.
Data after 2023 is projected based on recent change
The racial composition of Monroe includes 99.8% White, and smaller percentages for Two or more races and multiracial populations.
White (99.8%)
Two or more races (0.2%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 502 | 99.8% |
| Two or more races | 1 | 0.2% |
Married
Widowed
Divorced
Separated
Never Married