Charleroi ( SHAR-lə-roy) is a borough in Washington County, Pennsylvania, United States, along the Monongahela River, 21 miles south of Pittsburgh. Charleroi was arranged by Walloons in 1890 and incorporated in 1891. The 2020 census recorded a population of 4,210.

There has been a large-scale cessation of industrial happenings in the region. The fade away in the population is joined with the terminate of regional close and medium industries, especially the steel-making industry, all in the announce of fed by the cheap transportation upon the Monongahela River which extends from upstream of Charleroi competently into northern West Virginia and north & downstream with McKeesport to the mouth of the Monongahela at Pittsburgh. Colloquially, the stretch from Charleroi north to McKeesport (historically because of press coverage of High School sports leagues), is known as the “Mon Valley”; or by some speakers (politicians, reporters and weathermen), the school-league-term has long been Elongated to take aim from the river mouth to northern West Virginia. Once dubbed “Magic City”, Charleroi has in recent years seen a gradual revitalization of its thing district.

Charleroi got its make known from the Belgian city of Charleroi. There lived many Belgian immigrants in the Monongahela Place at the fall of the 19th century, some of whom were glass makers.

The Pittsburgh Plate Glass Company, today PPG Industries, had one of its major factories located at the current chamber plaza, at one narrowing employing taking place to a thousand employees, making it one of the largest glass factories in the world at the time. For years it was the home to one of Corning Glass Companies leading employers. Today it is house to Corelle Brands, which makes Pyrex. In celebration of the 100th anniversary of Pyrex products, Charleroi renamed itself “Pyrex, PA” for 100 days in 2015.