Resident Population in Mahoning County, OH was 225.59600 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Mahoning County, OH reached a record high of 306.30000 in January of 1971 and a record low of 225.59600 in January of 2023. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Mahoning County, OH - last updated from the United States Federal Reserve on May of 2024.