Resident Population in Polk County, AR was 19.43400 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Polk County, AR reached a record high of 20.66900 in January of 2010 and a record low of 13.29700 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Polk County, AR - last updated from the United States Federal Reserve on April of 2026.