Resident Population in Sioux County, ND was 3.64300 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Sioux County, ND reached a record high of 4.46700 in January of 2014 and a record low of 3.57500 in January of 1983. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Sioux County, ND - last updated from the United States Federal Reserve on May of 2024.