Major highways

Adjacent counties

• Polk County (north)
• Marion County (east)
• Lucas County (southeast)
• Clarke County (southwest)
• Madison County (west)

2020 census

The 2020 census recorded a population of 52,403 in the county, with a population density of 91.7049/sq mi (35.4075/km²). 95.46% of the population reported being of one race. There were 20,857 housing units, of which 19,616 were occupied.^[1]

2010 census

The 2010 census recorded a population of 46,225 in the county, with a population density of 80.8638/sq mi (31.2217/km²). There were 18,371 housing units, of which 17,262 were occupied.^[14]

2000 census

At the 2000 census there were 40,671 people, 14,708 households, and 11,207 families in the county. The population density was 71 inhabitants per square mile (27/km²). There were 15,289 housing units at an average density of 27 per square mile (10/km²). The racial makeup of the county was 98.08% White, 0.27% Black or African American, 0.17% Native American, 0.38% Asian, 0.04% Pacific Islander, 0.29% from other races, and 0.76% from two or more races. 1.08%.^[15] were Hispanic or Latino of any race.

Of the 14,708 households 37.80% had children under the age of 18 living with them, 64.50% were married couples living together, 8.80% had a female householder with no husband present, and 23.80% were non-families. 19.90% of households were one person and 8.70% were one person aged 65 or older. The average household size was 2.65 and the average family size was 3.05.

The age distribution was 27.00% under the age of 18, 9.70% from 18 to 24, 28.20% from 25 to 44, 23.20% from 45 to 64, and 11.80% 65 or older. The median age was 36 years. For every 100 females, there were 94.60 males. For every 100 females age 18 and over, there were 91.80 males.

The median household income was $50,349 and the median family income was $56,344. Males had a median income of $36,983 versus $26,768 for females. The per capita income for the county was $20,558. About 3.70% of families and 5.10% of the population were below the poverty line, including 6.40% of those under age 18 and 5.20% of those age 65 or over.

Cities

Unincorporated communities

• Beech
• Churchville
• Medora^[16][17][18]
• Cool
• Liberty Center
• Prole

Townships

Warren County has sixteen townships:^[19]

Population ranking

The population ranking of the following table is based on the 2020 census of Warren County.^[1]

† county seat