Champaign County is a county located in the U.S. state of Ohio. As of the 2010 census, the population was 40,097. Its county seat is Urbana. The county takes its name from the French word for "open level country".
Champaign County comprises the Urbana, OH Micropolitan Statistical Area, which is also included in the Dayton-Springfield-Sidney, OH Combined Statistical Area.
According to the U.S. Census Bureau, the county has a total area of 430 square miles (1,100 km²), of which 429 square miles (1,110 km²) is land and 1.2 square miles (3.1 km²) (0.3%) is water.
As of the 2010 United States Census, there were 40,097 people, 15,329 households, and 10,925 families residing in the county. The population density was 93.5 inhabitants per square mile (36.1/km²). There were 16,755 housing units at an average density of 39.1 per square mile (15.1/km²). The racial makeup of the county was 94.7% white, 2.2% black or African American, 0.4% Asian, 0.4% American Indian, 0.4% from other races, and 1.9% from two or more races. Those of Hispanic or Latino origin made up 1.1% of the population. In terms of ancestry, 27.6% were German, 14.9% were Irish, 14.3% were American, and 11.8% were English.
Of the 15,329 households, 33.7% had children under the age of 18 living with them, 55.9% were married couples living together, 10.2% had a female householder with no husband present, 28.7% were non-families, and 23.9% of all households were made up of individuals. The average household size was 2.56 and the average family size was 3.02. The median age was 39.7 years.
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