Bucks County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 646,538, making it the fourth-most populous county in Pennsylvania. Its county seat is Doylestown. The county is named after the English county of Buckinghamshire. The county represents the northern boundary of the Philadelphia–Camden–Wilmington, PA–NJ–DE–MD Metropolitan Statistical Area, known as the Delaware Valley.
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