Fort Jefferson in Darke County, Ohio — The American Midwest (Great Lakes)

Fort Jefferson

Photographed by Craig Doda, June 28, 2025

1. Fort Jefferson Marker

Inscription. Site of
frontier post
built by
Arthur St. Clair
1791

Erected by Ohio Historical Markers Committe.

Topics and series. This historical marker is listed in this topic list: Forts and Castles. In addition, it is included in the Ohio Historical Society / The Ohio History Connection series list. A significant historical year for this entry is 1791.

Location. 40° 1.463′ N, 84° 39.304′ W. Marker is in Fort Jefferson, Ohio, in Darke County. It is at the intersection of Ohio Route 121 and Weavers-Fort Jefferson Road, on the right when traveling north on Ohio Route 121. Touch for map. Marker is at or near this postal address: 3740 OH-121, Greenville OH 45331, United States of America. Touch for directions.

Regionally, this marker is in Ohio’s Till Plains.

It is also in the American Midwest

and in the Corn Belt.

Globally, it is in North America,

the Western Hemisphere,

the Western World,

and the Anglosphere.

Historically, it finds itself in what was once the Haudenosaunee (Iroquois) Confederacy,

the territory of the Mississippian Culture,

and the Northwest Territory.

Other nearby markers. At least 8 other markers are within walking distance of this marker: Well or Magazine Pit (about 500 feet away, measured in a direct line); Firepit (about 600 feet away); Excavation (about 600 feet away); Underground Passage (about 600 feet away); Fort Jefferson Veterans Memorial (about 600 feet away); Trench (about 600 feet away); Fort Jefferson / St. Clair’s Defeat (about 700 feet away); a different marker also named Fort Jefferson (about 700 feet away). Touch for a list and map of all markers in Fort Jefferson.

Another marker is no longer nearby. Fort Jefferson

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(was about 600 feet away but has been permanently removed).

Photographed by Craig Doda, June 28, 2025

2. Fort Jefferson Marker

Photographed by Craig Doda, June 28, 2025

3. Fort Jefferson Marker

Credits. This page was last revised on July 13, 2025. It was originally submitted on July 2, 2025, by Craig Doda of Napoleon, Ohio. This page has been viewed 95 times since then and 21 times this year. Photos: 1, 2, 3. submitted on July 2, 2025, by Craig Doda of Napoleon, Ohio. • J. Makali Bruton was the editor who published this page.