Income Inequality in Jefferson County, MT was 10.79541 Ratio in January of 2022, according to the United States Federal Reserve. Historically, Income Inequality in Jefferson County, MT reached a record high of 11.37374 in January of 2017 and a record low of 9.15635 in January of 2010. Trading Economics provides the current actual value, an historical data chart and related indicators for Income Inequality in Jefferson County, MT - last updated from the United States Federal Reserve on May of 2024.