Income Inequality in Plymouth County, IA was 10.46928 Ratio in January of 2022, according to the United States Federal Reserve. Historically, Income Inequality in Plymouth County, IA reached a record high of 10.46928 in January of 2022 and a record low of 8.94559 in January of 2013. Trading Economics provides the current actual value, an historical data chart and related indicators for Income Inequality in Plymouth County, IA - last updated from the United States Federal Reserve on May of 2024.