Estimate, Median Age by Sex, Total Population (5-year estimate) in Sioux County, ND was 27.10000 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 Sioux County, ND reached a record high of 28.60000 in January of 2020 and a record low of 25.80000 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 Sioux County, ND - last updated from the United States Federal Reserve on May of 2024.