Estimate, Median Age by Sex, Total Population (5-year estimate) in Seward County, KS was 30.50000 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 Seward County, KS reached a record high of 30.50000 in January of 2022 and a record low of 29.00000 in January of 2012. 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 Seward County, KS - last updated from the United States Federal Reserve on May of 2024.