Estimate, Median Age by Sex, Total Population (5-year estimate) in Jefferson County, OH was 44.30000 Years of Age in January of 2022, according to the United States Federal Reserve. Historically, Estimate, Median Age by Sex, Total Population (5-year estimate) in Jefferson County, OH reached a record high of 44.90000 in January of 2020 and a record low of 43.70000 in January of 2011. Trading Economics provides the current actual value, an historical data chart and related indicators for Estimate, Median Age by Sex, Total Population (5-year estimate) in Jefferson County, OH - last updated from the United States Federal Reserve on May of 2024.