Resident Population in Preble County, OH was 40.55600 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Preble County, OH reached a record high of 42.38900 in January of 1999 and a record low of 34.71900 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Preble County, OH - last updated from the United States Federal Reserve on May of 2024.