Estimate, Median Age by Sex, Total Population (5-year estimate) in Sully County, SD was 52.70000 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 Sully County, SD reached a record high of 52.70000 in January of 2022 and a record low of 42.80000 in January of 2016. 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 Sully County, SD - last updated from the United States Federal Reserve on May of 2024.