Washington is a city in, and the county seat of, Washington County, Pennsylvania, United States. The population was 13,176 at the time …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.
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