La Salle County, IL - Estimate, Median Age by Sex, Total Population (5-year estimate) in LaSalle County, IL was 41.90000 Years of Age in January of 2022, according to the United States Federal Reserve. Historically, La Salle County, IL - Estimate, Median Age by Sex, Total Population (5-year estimate) in LaSalle County, IL reached a record high of 42.10000 in January of 2020 and a record low of 40.00000 in January of 2009. Trading Economics provides the current actual value, an historical data chart and related indicators for La Salle County, IL - Estimate, Median Age by Sex, Total Population (5-year estimate) in LaSalle County, IL - last updated from the United States Federal Reserve on May of 2024.