Resident Population in Sioux County, NE was 1.15400 Thous. of Persons in January of 2023, 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 1.12700 in January of 2022. 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 May of 2024.