Housing Inventory: Median Home Size in Square Feet Year-Over-Year in Missoula County, MT was 6.14% in July of 2026, according to the United States Federal Reserve. Historically, Housing Inventory: Median Home Size in Square Feet Year-Over-Year in Missoula County, MT reached a record high of 15.93 in January of 2021 and a record low of -14.08 in February of 2019. Trading Economics provides the current actual value, an historical data chart and related indicators for Housing Inventory: Median Home Size in Square Feet Year-Over-Year in Missoula County, MT - last updated from the United States Federal Reserve on September of 2026.