Income Inequality in Custer County, MT was 13.90802 Ratio in January of 2022, according to the United States Federal Reserve. Historically, Income Inequality in Custer County, MT reached a record high of 13.90802 in January of 2022 and a record low of 10.61025 in January of 2010. Trading Economics provides the current actual value, an historical data chart and related indicators for Income Inequality in Custer County, MT - last updated from the United States Federal Reserve on May of 2024.