Warren County is a county in the U.S. state of Ohio. As of the 2010 census, the population was 212,693. Its county seat is Lebanon. The county was created on May 1, 1803 from Hamilton County; it is named for Dr. Joseph Warren, a hero of the Revolution who sent Paul Revere on his ride and who died at the Battle of Bunker Hill.
Warren County is part of the Cincinnati-Middletown, OH-KY-IN Metropolitan Statistical Area.
According to the U.S. Census Bureau, the county has a total area of 407 square miles (1,050 km²), of which 401 square miles (1,040 km²) is land and 6.0 square miles (16 km²) (1.5%) is water. The county is a rough square with the sides roughly 20 miles (30 km) long.
As of the 2010 United States Census, there were 212,693 people, 76,424 households, and 57,621 families residing in the county. The population density was 530.0 inhabitants per square mile (204.6/km²). There were 80,750 housing units at an average density of 201.2 per square mile (77.7/km²). The racial makeup of the county was 90.5% white, 3.9% Asian, 3.3% black or African American, 0.2% American Indian, 0.7% from other races, and 1.5% from two or more races. Those of Hispanic or Latino origin made up 2.2% of the population. In terms of ancestry, 28.7% were German, 14.1% were Irish, 12.0% were English, 11.6% were American, and 5.0% were Italian.
Of the 76,424 households, 40.1% had children under the age of 18 living with them, 62.6% were married couples living together, 8.8% had a female householder with no husband present, 24.6% were non-families, and 20.4% of all households were made up of individuals. The average household size was 2.70 and the average family size was 3.14. The median age was 37.8 years.
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