Estimate, Median Age by Sex, Total Population (5-year estimate) in Green Lake County, WI was 45.30000 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 Green Lake County, WI reached a record high of 45.60000 in January of 2020 and a record low of 43.60000 in January of 2010. 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 Green Lake County, WI - last updated from the United States Federal Reserve on May of 2024.