Net County-to-County Migration Flow (5-year estimate) for Sweet Grass County, MT was 100.00000 Persons in January of 2020, according to the United States Federal Reserve. Historically, Net County-to-County Migration Flow (5-year estimate) for Sweet Grass County, MT reached a record high of 118.00000 in January of 2018 and a record low of -169.00000 in January of 2012. Trading Economics provides the current actual value, an historical data chart and related indicators for Net County-to-County Migration Flow (5-year estimate) for Sweet Grass County, MT - last updated from the United States Federal Reserve on May of 2024.