Connellsville is a city in Fayette County, Pennsylvania, United States, 50 miles southeast of Pittsburgh on the Youghiogheny River, a tributary of the Monongahela River. It is part of the Pittsburgh Metro Area. The population was 7,637 at the 2010 census, down from 9,146 at the 2000 census.During the French and Indian War, a British army commanded by General Edward Braddock approached Fort Duquesne and crossed the Youghiogheny River at Stewart's Crossing, which is situated in the middle of what is now the city of Connellsville.Connellsville was officially founded as a township in 1793 then as a borough on March 1, 1806, by Zachariah Connell, a militia captain during the American Revolution. In February 1909, balloting in New Haven and Connellsville resulted in these two boroughs joining and becoming the first city in Fayette County on May 12, 1911.