Resident Population in Washington County, KY was 12.26700 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Washington County, KY reached a record high of 12.26700 in January of 2023 and a record low of 10.36700 in January of 1993. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Washington County, KY - last updated from the United States Federal Reserve on May of 2024.