Union County is a county located in the U.S. state of Ohio. As of the 2010 census, the population was 52,300. Its county seat is Marysville. Its name is reflective of its origins, it being the union of portions of Franklin, Delaware, Madison, and Logan counties. Union County is part of the Columbus, OH Metropolitan Statistical Area.
According to the U.S. Census Bureau, the county has a total area of 437 square miles (1,130 km²), of which 432 square miles (1,120 km²) is land and 5.1 square miles (13 km²) (1.2%) is water.
As of the 2010 United States Census, there were 52,300 people, 18,065 households, and 13,681 families residing in the county. The population density was 121.1 inhabitants per square mile (46.8/km²). There were 19,429 housing units at an average density of 45.0 per square mile (17.4/km²). The racial makeup of the county was 92.9% white, 2.7% Asian, 2.4% black or African American, 0.2% American Indian, 0.3% from other races, and 1.4% from two or more races. Those of Hispanic or Latino origin made up 1.3% of the population. In terms of ancestry, 34.1% were German, 15.3% were Irish, 13.6% were English, and 13.6% were American.
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