Resident Population in Union County, OR was 25.94400 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Union County, OR reached a record high of 26.73300 in January of 2018 and a record low of 19.37700 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Union County, OR - last updated from the United States Federal Reserve on May of 2024.