Estimate, Median Age by Sex, Total Population (5-year estimate) in Maries County, MO was 45.20000 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 Maries County, MO reached a record high of 46.00000 in January of 2019 and a record low of 41.00000 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 Maries County, MO - last updated from the United States Federal Reserve on May of 2024.