Resident Population in Letcher County, KY was 20.42300 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Letcher County, KY reached a record high of 30.76300 in January of 1981 and a record low of 20.42300 in January of 2023. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Letcher County, KY - last updated from the United States Federal Reserve on May of 2024.