Estimate, Median Age by Sex, Total Population (5-year estimate) in Madison County, ID was 21.60000 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 Madison County, ID reached a record high of 23.50000 in January of 2017 and a record low of 21.60000 in January of 2022. 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 Madison County, ID - last updated from the United States Federal Reserve on May of 2024.