Belle Vernon is a borough in Fayette County, Pennsylvania, United States. It is situated along the Monongahela River abutting two other counties, Westmoreland to the north and Washington across the river. As of the 2010 census Belle Vernon had a population of 1,093.
"Bellevernon", as it was originally spelled, was laid out in 1813 by Noah Speers in northwestern Fayette County. French for "beautiful green", this was the name chosen by both Noah Speers for his little community on the Monongahela River and later by his son Louis, who founded a town with nearly the same name just up the hill (North Belle Vernon, Pennsylvania). Directly across the river lies the borough of Speers, anchoring the far side of the landmark I-70 bridge as the east bridge abutments lie in adjacent Rostraver Township.
Belle Vernon is located at 40°7′37″N 79°52′6″W (40.126936, -79.868285), nestled in the northwest corner of Fayette County, with abutting borders on Washington County, to the west across the river, and Westmoreland County to the north.
According to the United States Census Bureau, the borough has a total area of 0.31 square miles (0.81 km2), of which 0.25 square miles (0.65 km2) is land and 0.07 square miles (0.17 km2), or 20.29%, is water.
Belle Vernon has three land borders with Washington Township to the southeast and the Westmoreland County neighborhoods of North Belle Vernon to the north and Rostraver Township to the northwest. Across the Monongahela River to the south in Washington County, Belle Vernon runs adjacent with the aforementioned borough of Speers as well as Dunlevy.
Noah Speers was the father of Louis M. Speers, born in a log cabin on the Speers homestead/Gibsonton farm in 1810. The younger Speers played a large role in the development of Belle Vernon.