Estimate, Median Age by Sex, Total Population (5-year estimate) in Hill County, MT was 33.40000 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 Hill County, MT reached a record high of 35.60000 in January of 2010 and a record low of 33.40000 in January of 2022. 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 Hill County, MT - last updated from the United States Federal Reserve on May of 2024.