Belle Vernon is a borough in Fayette County, Pennsylvania, United States. It is situated along the Monongahela River and is part of a greater community 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 Speer in northwestern Fayette County. French for "beautiful green", this was the name chosen by both Noah Speer 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. Directly across the river lies the borough of Speers, anchoring the far side of the landmark I-70 bridge as Belle Vernon does the east bridge abutments.