Greenville is a city in and the county seat of Darke County, Ohio, United States. It is located near Ohio's western edge, about 33 miles (53 km) northwest of Dayton. The population was 12,786 at the 2020 census.

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Greenville
City
Henry St. Clair Memorial Hall
Nickname:  "The Treaty City"
Location in Darke County and the state of Ohio.
Greenville Show map of Ohio Greenville Show map of the United States
Coordinates: 40°06′15″N 84°37′41″W
Country	United States
State	Ohio
County	Darke
Government
• Mayor	Jeff Whitaker[1]
Area [2]
• Total	6.72 sq mi (17.39 km2)
• Land	6.65 sq mi (17.23 km2)
• Water	0.06 sq mi (0.16 km2)
Elevation [3]	1,043 ft (318 m)
Population  (2020)
• Total	12,786
• Density	1,922.13/sq mi (742.09/km2)
Time zone	UTC-5 (Eastern (EST))
• Summer (DST)	UTC-4 (EDT)
ZIP code	45331
Area code(s)	937, 326
FIPS code	39-32340[4]
GNIS feature ID	1064762[3]
Website	http://www.cityofgreenville.org/

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Indigenous tribes in the region included the Wyandot, the Delaware, the Shawnee, the Ottawa, the Chippewa, the Pottawatomi, the Miami, the Wea, the Kickapoo, the Piankasha, the Kaskaskia and the Eel River. These participated in the Northwest Indian War, their effort to repel European Americans from the Northwest Territory.

Greenville is the historic location of Fort Greene Ville, built in November 1793 by General Anthony Wayne's Legion of the United States during the Northwest Indian War. Named for Revolutionary War hero Nathaniel Greene, its defenses covered about 55 acres (220,000 m²), making it North America's largest wooden fort. It was a training ground and base of operations for the ~3000 soldiers of the Legion and Kentucky Militia before their August 1794 march northward to the Battle of Fallen Timbers. A year after the battle, the Treaty of Greenville was signed at the fort on August 3, 1795, with chiefs of the tribes that had confronted the U.S. This brought an end to the Indian wars in the area and opened the Northwest Territory for European-American settlement.^[5]

In 1805^[6] or 1806,^[7] the Shawnee chief Tecumseh and his younger brother Tenskwatawa established an illegal settlement in Greenville.^{[6][lower-alpha 1]} In peaceful protest of the boundary line of the Treaty of Greenville, their group occupied the confluence of Mud Creek and Greenville Creek until 1808.^[7][9] Under pressure from William Henry Harrison, territorial governor of Indiana,^[10] and the burgeoning population of settlers, Tecumseh, Tenskwatawa, and their followers relocated to Prophetstown, Indiana,^[6] near which the intertribal confederacy was shattered at the Battle of Tippecanoe.^[8] Tenskwatawa visited Greenville by request in 1826 as he accompanied the Shawnee during their removal by the U.S. Army.^[6]

The Army abandoned Fort Greenville in 1796; it was partly burned later that year to retrieve nails used in its construction. Local settlers carried away some of its logs for building the new settlement of Dayton, Ohio, to the south. In the War of 1812, the Army refitted what remained of the fort; it was used as a supply depot and staging area. The earliest European-American settlers came in 1807; the city of Greenville was officially founded in August 1808.^{[citation needed]}

According to the United States Census Bureau, the city has an 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.^[11]

Local airports include Darke County Airport, seven miles away in Versailles, and James M. Cox Dayton International Airport, 35 miles away in Vandalia.

Various companies and brands such as KitchenAid and BASF North America have offices in Greenville.

This section does not cite any sources. (February 2024)

Greenville hosts the Darke County Fair, which runs annually for nine days in August.

Built in 1849, the historic Bear's Mill is an example of a stonegrinding flour mill of its time. Placed on the National Register of Historic Places in 1977, it is used today to grind cornmeal, whole-wheat flour, rye flour, and pancake mixes. The mill and the buhr stones are powered by water. Self-guided tours may be taken during regular business hours.

Greenville has a local history museum, the Garst Museum, which features the most extensive known collections of memorabilia of Annie Oakley and Lowell Thomas, both of whom were born nearby. It also holds historical artifacts relating to Anthony Wayne and the Treaty of Greenville, as well as Native American artifacts.

The museum also includes a village of shops; a wing of early American furnishings, pioneer life, and military uniforms; an early Indianapolis 500 race car built in Greenville; and an extensive genealogy room for research. Also in Greenville is St. Clair Memorial Hall, Darke County's center for the arts. Built in 1910, it has been completely remodeled and is a showpiece for all of Darke County.

The city and surrounding areas are served by a daily newspaper published in Greenville, The Daily Advocate.