Greene County is a county located in the U.S. state of Ohio. As of the 2010 census, the population was 161,573. Its county seat is Xenia. The county was established on March 24, 1803 and named for General Nathanael Greene, an officer in the Revolutionary War.
Greene County is part of the Dayton, OH Metropolitan Statistical Area.
According to the U.S. Census Bureau, the county has a total area of 416 square miles (1,080 km²), of which 414 square miles (1,070 km²) is land and 2.5 square miles (6.5 km²) (0.6%) is water.
As of the 2010 United States Census, there were 161,573 people, 62,770 households, and 41,696 families residing in the county. The population density was 390.5 inhabitants per square mile (150.8/km²). There were 68,241 housing units at an average density of 164.9 per square mile (63.7/km²). The racial makeup of the county was 86.4% white, 7.2% black or African American, 2.9% Asian, 0.3% American Indian, 0.1% Pacific islander, 0.5% from other races, and 2.6% from two or more races. Those of Hispanic or Latino origin made up 2.1% of the population. In terms of ancestry, 26.4% were German, 15.7% were American, 13.0% were Irish, and 10.9% were English.
Of the 62,770 households, 30.1% had children under the age of 18 living with them, 51.9% were married couples living together, 10.6% had a female householder with no husband present, 33.6% were non-families, and 26.5% of all households were made up of individuals. The average household size was 2.43 and the average family size was 2.95. The median age was 37.2 years.
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