Monroe is a city in east central Butler and west central Warren counties in the southwestern part of the U.S. state of Ohio. The population was 15,412 at the 2020 census. Monroe is a part of the Cincinnati metropolitan area.
History
thumb|left|View of the Great Miami Pike, present-day Cincinnati Dayton Road. Coming from the right is South Street, present-day Lebanon Street. The two houses on that corner still stand. Across the street today are the post office and the City Building.
Monroe was laid out in 1817 on the Dayton and Cincinnati pike. The city is named for President James Monroe, fifth President of the United States.
In the early 1830s, Monroe contained one store and 119 inhabitants.
Geography
According to the United States Census Bureau, the city has a total area of , of which is land and is water.
Demographics
2020 census
As of the 2020 census, Monroe had a population of 15,412. The median age was 37.6 years. 27.3% of residents were under the age of 18 and 15.8% of residents were 65 years of age or older. For every 100 females there were 95.6 males, and for every 100 females age 18 and over there were 91.4 males age 18 and over.
There were 5,484 households in Monroe, of which 40.0% had children under the age of 18 living in them. Of all households, 59.2% were married-couple households, 13.6% were households with a male householder and no spouse or partner present, and 21.2% were households with a female householder and no spouse or partner present. About 20.8% of all households were made up of individuals and 10.2% had someone living alone who was 65 years of age or older.
! Race !! Number !! Percent
|-
| White || 12,908 || 83.8%
|-
| Black or African American || 792 || 5.1%
|-
| American Indian and Alaska Native || 38 || 0.2%
|-
| Asian || 498 || 3.2%
|-
| Native Hawaiian and Other Pacific Islander || 9 || 0.1%
|-
| Some other race || 238 || 1.5%
|-
| Two or more races || 929 || 6.0%
|-
| Hispanic or Latino (of any race) || 526 || 3.4%
|}
2010 census
As of the census of 2010, there were 12,442 people, 4,649 households, and 3,481 families living in the city. The population density was . There were 4,896 housing units at an average density of . The racial makeup of the city was 92.6% White, 3.7% African American, 0.2% Native American, 1.7% Asian, 0.7% from other races, and 1.3% from two or more races. Hispanic or Latino of any race were 1.8% of the population.
There were 4,649 households, of which 39.2% had children under the age of 18 living with them, 61.6% were married couples living together, 8.8% had a female householder with no husband present, 4.5% had a male householder with no wife present, and 25.1% were non-families. 21.3% of all households were made up of individuals, and 10.1% had someone living alone who was 65 years of age or older. The average household size was 2.63 and the average family size was 3.07.
The median age in the city was 36.9 years. 27% of residents were under the age of 18; 5.9% were between the ages of 18 and 24; 29.7% were from 25 to 44; 23.1% were from 45 to 64; and 14.3% were 65 years of age or older. The gender makeup of the city was 48.8% male and 51.2% female.
2000 census
As of the census