Resident Population in Saginaw County, MI was 187.68800 Thous. of Persons in January of 2025, according to the United States Federal Reserve. Historically, Resident Population in Saginaw County, MI reached a record high of 228.05900 in January of 1980 and a record low of 187.68800 in January of 2025. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Saginaw County, MI - last updated from the United States Federal Reserve on May of 2026.