Resident Population in Clay County, MN was 66.25800 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Clay County, MN reached a record high of 66.25800 in January of 2023 and a record low of 46.60800 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Clay County, MN - last updated from the United States Federal Reserve on May of 2024.