Highland County is a county located in the U.S. state of Ohio. As of the 2010 census, the population was 43,589. Its county seat is Hillsboro. The county is named for the topography which is hilly and divides the watersheds of the Little Miami and Scioto Rivers.
According to the U.S. Census Bureau, the county has a total area of 558 square miles (1,450 km²), of which 553 square miles (1,430 km²) is land and 4.7 square miles (12 km²) (0.8%) is water.
As of the 2010 United States Census, there were 43,589 people, 16,693 households, and 11,819 families residing in the county. The population density was 78.8 inhabitants per square mile (30.4/km²). There were 19,380 housing units at an average density of 35.0 per square mile (13.5/km²). The racial makeup of the county was 96.5% white, 1.4% black or African American, 0.3% American Indian, 0.2% Asian, 0.1% from other races, and 1.5% from two or more races. Those of Hispanic or Latino origin made up 0.7% of the population. In terms of ancestry, 23.8% were German, 14.9% were Irish, 14.3% were American, and 10.7% were English.
Of the 16,693 households, 34.0% had children under the age of 18 living with them, 53.1% were married couples living together, 11.9% had a female householder with no husband present, 29.2% were non-families, and 24.3% of all households were made up of individuals. The average household size was 2.58 and the average family size was 3.04. The median age was 39.2 years.
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