Butler County is a county in the U.S. state of Ohio. As of the 2010 census, the population was 368,130. Its county seat is Hamilton. It is named for General Richard Butler, who died in 1791 during St. Clair's Defeat. It is also home to Miami University, an Ohio public university that was founded in 1809 as the second university in the State of Ohio.
Butler County is part of the Cincinnati, OH-KY-IN Metropolitan Statistical Area and the majority of the county rest in District 52.
Butler County was formed on March 24, 1803 from portions of Hamilton County. It is named for General Richard Butler. Between 1803 and 1823, the townships of the county became officially recognized. Large portions of the county were held by non resident owners, including 640 acres owned by future President William H Harrison. Some land that was originally part of Butler County was reassigned to Warren County in the north and Hamilton County to the south. Butler County's original size was 480 sq miles.
According to the U.S. Census Bureau, the county has a total area of 470 square miles (1,200 km²), of which 467 square miles (1,210 km²) is land and 3.1 square miles (8.0 km²) (0.7%) is water.
As of the 2010 United States Census, there were 368,130 people, 135,960 households, and 95,404 families residing in the county. The population density was 788.2 inhabitants per square mile (304.3/km²). There were 148,273 housing units at an average density of 317.5 per square mile (122.6/km²). The racial makeup of the county was 86.0% white, 7.3% black or African American, 2.4% Asian, 0.2% American Indian, 0.1% Pacific islander, 1.8% from other races, and 2.1% from two or more races. Those of Hispanic or Latino origin made up 4.0% of the population. In terms of ancestry, 27.0% were German, 14.8% were American, 13.6% were Irish, and 9.7% were English.
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