Washington is a city in, and the county seat of, Washington County, Pennsylvania, United States. The population was 13,176 at the time of the 2020 census. Part of the Pittsburgh metropolitan area in the southwestern part of the state, the city is home to Washington & Jefferson College and Pony League baseball.

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.