Income Inequality in Marshall County, SD was 12.88537 Ratio in January of 2022, according to the United States Federal Reserve. Historically, Income Inequality in Marshall County, SD reached a record high of 14.53028 in January of 2013 and a record low of 9.42976 in January of 2019. Trading Economics provides the current actual value, an historical data chart and related indicators for Income Inequality in Marshall County, SD - last updated from the United States Federal Reserve on May of 2024.