Greenville is a city in and county seat of Darke County, Ohio, United States. The population was 13,227 at the 2010 census.
Greenville is the historic location of Fort Greeneville, which was built in 1793 by General Anthony Wayne's soldiers during the Northwest Indian War. Named for Revolutionary War hero Nathaniel Greene, its defenses covered about 55 acres (220,000 m²), which made it the largest wooden fort in North America. Two years later, the Treaty of Greenville was signed at the fort on August 3, 1795, bringing an end to the Indian wars in the area and opening the Northwest Territory for settlement. Fort Greenville was abandoned in 1796, and the town Greenville soon grew up on the site.
According to the United States Census Bureau, the city has a total area of 6.66 square miles (17.25 km²), of which 6.60 square miles (17.09 km²) is land and 0.06 square miles (0.16 km²) is water.
Local airports include Darke County Airport, seven miles away in Versailles and James M. Cox Dayton International Airport 35 miles away in Vandalia.
As of the census of 2010, there were 13,227 people, 5,933 households, and 3,430 families residing in the city. The population density was 2,004.1 inhabitants per square mile (773.8/km²). There were 6,536 housing units at an average density of 990.3 per square mile (382.4/km²). The racial makeup of the city was 96.7% White, 0.9% African American, 0.2% Native American, 0.7% Asian, 0.3% from other races, and 1.1% from two or more races. Hispanic or Latino of any race were 1.4% of the population.
There were 5,933 households of which 26.3% had children under the age of 18 living with them, 41.2% were married couples living together, 12.0% had a female householder with no husband present, 4.7% had a male householder with no wife present, and 42.2% were non-families. 37.5% of all households were made up of individuals, and 19.4% had someone living alone who was 65 years of age or older. The average household size was 2.17, and the average family size was 2.83.
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