Resident Population in Shiawassee County, MI was 68.02500 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Shiawassee County, MI reached a record high of 72.63500 in January of 2004 and a record low of 63.07500 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Shiawassee County, MI - last updated from the United States Federal Reserve on May of 2024.