Resident Population in Darke County, OH was 51.41500 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Darke County, OH reached a record high of 55.60000 in January of 1979 and a record low of 49.14100 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Darke County, OH - last updated from the United States Federal Reserve on May of 2024.