Income Inequality in Granite County, MT was 13.97605 Ratio in January of 2022, according to the United States Federal Reserve. Historically, Income Inequality in Granite County, MT reached a record high of 15.21756 in January of 2021 and a record low of 9.30047 in January of 2014. Trading Economics provides the current actual value, an historical data chart and related indicators for Income Inequality in Granite County, MT - last updated from the United States Federal Reserve on May of 2024.