Resident Population in Marshall County, MN was 8.77100 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Marshall County, MN reached a record high of 13.40000 in January of 1978 and a record low of 8.77100 in January of 2024. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Marshall County, MN - last updated from the United States Federal Reserve on April of 2026.