Net County-to-County Migration Flow (5-year estimate) for Fallon County, MT was 0.00000 Persons in January of 2020, according to the United States Federal Reserve. Historically, Net County-to-County Migration Flow (5-year estimate) for Fallon County, MT reached a record high of 231.00000 in January of 2013 and a record low of -67.00000 in January of 2019. 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 Fallon County, MT - last updated from the United States Federal Reserve on May of 2024.