Resident Population in Gratiot County, MI was 41.36800 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Gratiot County, MI reached a record high of 42.48000 in January of 2000 and a record low of 38.84400 in January of 1987. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Gratiot County, MI - last updated from the United States Federal Reserve on May of 2024.