Resident Population in Rosebud County, MT was 8.19400 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Rosebud County, MT reached a record high of 13.36300 in January of 1983 and a record low of 6.03200 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Rosebud County, MT - last updated from the United States Federal Reserve on April of 2026.