West Brownsville is a former important transportation nexus and a present-day borough in Washington County, Pennsylvania, United States and part of the Pittsburgh metropolitan area. The population was 972 at the 2020 census. Culturally, by postal route, and socially, the community is connected to cross-river sister-city Brownsville, for the two were long joined by the Amerindian trail known as Nemacolin's Path that became a wagon road after the American Revolution, but West Brownsville is a separate municipality. Brownsville was the first point where the descent from the Appalachians could safely reach the river down the generally steep banks of the Monongahela River. Between Brownsville and West Brownsville was a shallow stretch, usable as a river ford astride a major Emigrant Trail to the various attractive regions in the Northwest Territory, the first National Road, the Cumberland Pike.

Washington County is a county in the Commonwealth of Pennsylvania, United States. As of the 2020 census, the population was 209,349. Its county seat is Washington. The county is part of the Greater Pittsburgh region of the state.