Estimate, Median Age by Sex, Total Population (5-year estimate) in Brown County, SD was 37.30000 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 Brown County, SD reached a record high of 39.40000 in January of 2012 and a record low of 36.90000 in January of 2018. 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 Brown County, SD - last updated from the United States Federal Reserve on May of 2024.