Resident Population in Clarion County, PA was 36.97000 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Clarion County, PA reached a record high of 43.41600 in January of 1981 and a record low of 36.97000 in January of 2023. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Clarion County, PA - last updated from the United States Federal Reserve on May of 2024.