Resident Population in Aitkin County, MN was 16.33500 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Aitkin County, MN reached a record high of 16.33500 in January of 2024 and a record low of 11.40300 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Aitkin County, MN - last updated from the United States Federal Reserve on April of 2026.