Resident Population in Blair County, PA was 120.27300 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Blair County, PA reached a record high of 138.00000 in January of 1979 and a record low of 120.27300 in January of 2023. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Blair County, PA - last updated from the United States Federal Reserve on June of 2024.