Resident Population in Ohio County, IN was 5.99600 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Ohio County, IN reached a record high of 6.08900 in January of 2022 and a record low of 4.28900 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Ohio County, IN - last updated from the United States Federal Reserve on April of 2026.