Net County-to-County Migration Flow (5-year estimate) for Granite County, MT was 178.00000 Persons in January of 2020, according to the United States Federal Reserve. Historically, Net County-to-County Migration Flow (5-year estimate) for Granite County, MT reached a record high of 205.00000 in January of 2011 and a record low of -23.00000 in January of 2016. 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 Granite County, MT - last updated from the United States Federal Reserve on May of 2024.