Estimate, Median Age by Sex, Total Population (5-year estimate) in Nemaha County, KS was 40.00000 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 Nemaha County, KS reached a record high of 42.70000 in January of 2010 and a record low of 39.90000 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 Nemaha County, KS - last updated from the United States Federal Reserve on May of 2024.