Resident Population in Warren County, PA was 37.57200 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Warren County, PA reached a record high of 49.20000 in January of 1972 and a record low of 37.57200 in January of 2023. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Warren County, PA - last updated from the United States Federal Reserve on May of 2024.