High Quality Content by WIKIPEDIA articles! Uniontown is a city in Fayette County, Pennsylvania, 50 miles (80 km) southeast of Pittsburgh and part of the Pittsburgh Metro Area. Population in 1900, 7,344; in 1910, 13,344; in 1920, 15,692; and in 1940, 21,819. The population was 10,372 at the 2010 census. It is the county seat and largest city of Fayette County.