Resident Population in Highland County, OH was 43.78500 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Highland County, OH reached a record high of 43.78500 in January of 2024 and a record low of 28.99600 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Highland County, OH - last updated from the United States Federal Reserve on April of 2026.