Estimate, Median Age by Sex, Total Population (5-year estimate) in Columbia County, WA was 50.80000 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 Columbia County, WA reached a record high of 51.30000 in January of 2011 and a record low of 47.20000 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 Columbia County, WA - last updated from the United States Federal Reserve on May of 2024.