Munhall is a borough in Allegheny County, Pennsylvania, on the west bank of the Monongahela River, 8 miles (13 km) south of the confluence of the Monongahela and the Allegheny rivers where the Ohio River begins. It abuts the borough of Homestead. A large part of the Homestead Works of the Carnegie Steel Company existed in Munhall. Steel products were the only items made in Munhall in 1910 when 5,185 people lived here. In 1940, 13,900 people lived in Munhall. The population was 11,406 at the 2010 census.