Unemployment Rate in Sioux County, IA was 2.40% in June of 2025, according to the United States Federal Reserve. Historically, Unemployment Rate in Sioux County, IA reached a record high of 5.30 in April of 2020 and a record low of 1.10 in October of 2018. Trading Economics provides the current actual value, an historical data chart and related indicators for Unemployment Rate in Sioux County, IA - last updated from the United States Federal Reserve on September of 2025.