Resident Population in Montana was 1137.23300 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Montana reached a record high of 1137.23300 in January of 2024 and a record low of 245.00000 in January of 1900. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Montana - last updated from the United States Federal Reserve on February of 2026.