Resident Population in Foster County, ND was 3.30900 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Foster County, ND reached a record high of 4.90000 in January of 1971 and a record low of 3.21200 in January of 2018. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Foster County, ND - last updated from the United States Federal Reserve on May of 2024.