Net County-to-County Migration Flow (5-year estimate) for Jefferson County, MT was 738.00000 Persons in January of 2020, according to the United States Federal Reserve. Historically, Net County-to-County Migration Flow (5-year estimate) for Jefferson County, MT reached a record high of 738.00000 in January of 2020 and a record low of 365.00000 in January of 2009. 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 Jefferson County, MT - last updated from the United States Federal Reserve on May of 2024.