Resident Population in Union County, AR was 37.39700 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Union County, AR reached a record high of 50.10000 in January of 1979 and a record low of 37.39700 in January of 2023. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Union County, AR - last updated from the United States Federal Reserve on May of 2024.