Resident Population in Slope County, ND was 0.67400 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Slope County, ND reached a record high of 1.48400 in January of 1970 and a record low of 0.64300 in January of 2009. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Slope County, ND - last updated from the United States Federal Reserve on May of 2024.