Mingo Junction is a village in Jefferson County, Ohio, United States, along the Ohio River. The population was 3,631 at the 2000 census. In 1900, its only manufacturing plant was a steel mill owned by Carnegie Steel Company. Past population figures are: 1900, 2,954; 1910, 4,049; 1940, 5,192. Mingo Junction is part of the Weirton–Steubenville, WV-OH Metropolitan Statistical Area. The Mingo Indian tribe once had a settlement at the location of the present day village, which is the source of its name. Originally known as Mingo Bottom, it was the starting point for the ill-fated Crawford expedition against hostile Indians in 1782, during the American Revolutionary War.