Resident Population in Fayette County, PA was 123.91500 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Fayette County, PA reached a record high of 162.70000 in January of 1979 and a record low of 123.91500 in January of 2023. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Fayette County, PA - last updated from the United States Federal Reserve on May of 2024.