Estimate, Median Age by Sex, Total Population (5-year estimate) in Franklin County, IA was 42.80000 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 Franklin County, IA reached a record high of 43.50000 in January of 2020 and a record low of 42.00000 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 Franklin County, IA - last updated from the United States Federal Reserve on May of 2024.