Income Inequality in Yellowstone County, MT was 13.42131 Ratio in January of 2022, according to the United States Federal Reserve. Historically, Income Inequality in Yellowstone County, MT reached a record high of 13.92766 in January of 2021 and a record low of 11.18973 in January of 2010. Trading Economics provides the current actual value, an historical data chart and related indicators for Income Inequality in Yellowstone County, MT - last updated from the United States Federal Reserve on May of 2024.