Resident Population in Bucks County, PA was 645.98400 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Bucks County, PA reached a record high of 647.15900 in January of 2021 and a record low of 416.72800 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Bucks County, PA - last updated from the United States Federal Reserve on May of 2024.