Resident Population in Sioux County, NE was 1.09900 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Sioux County, NE reached a record high of 2.20000 in January of 1973 and a record low of 1.09900 in January of 2024. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Sioux County, NE - last updated from the United States Federal Reserve on March of 2026.