Miami County is a county located in the U.S. state of Ohio. As of the 2010 census, the population was 102,506. Its county seat is Troy. The county is named for an Indian word of disputed meaning.
Miami County is part of the Dayton, OH Metropolitan Statistical Area.
According to the U.S. Census Bureau, the county has a total area of 410 square miles (1,100 km²), of which 407 square miles (1,050 km²) is land and 3.1 square miles (8.0 km²) (0.8%) is water.
As of the 2010 United States Census, there were 102,506 people, 40,917 households, and 28,626 families residing in the county. The population density was 252.1 inhabitants per square mile (97.3/km²). There were 44,256 housing units at an average density of 108.8 per square mile (42.0/km²). The racial makeup of the county was 94.4% white, 2.0% black or African American, 1.2% Asian, 0.2% American Indian, 0.5% from other races, and 1.8% from two or more races. Those of Hispanic or Latino origin made up 1.3% of the population. In terms of ancestry, 34.5% were German, 13.5% were Irish, 10.2% were English, and 9.8% were American.
Of the 40,917 households, 32.3% had children under the age of 18 living with them, 54.7% were married couples living together, 10.5% had a female householder with no husband present, 30.0% were non-families, and 25.3% of all households were made up of individuals. The average household size was 2.48 and the average family size was 2.95. The median age was 40.6 years.
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