Estimate, Median Age by Sex, Total Population (5-year estimate) in Dubuque County, IA was 38.70000 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 Dubuque County, IA reached a record high of 38.90000 in January of 2014 and a record low of 38.10000 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 Dubuque County, IA - last updated from the United States Federal Reserve on May of 2024.