Estimate, Median Age by Sex, Total Population (5-year estimate) in Washington County, IN was 40.90000 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 Washington County, IN reached a record high of 41.60000 in January of 2019 and a record low of 38.10000 in January of 2009. 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 Washington County, IN - last updated from the United States Federal Reserve on May of 2024.