Resident Population in St. Joseph County, MI was 60.87800 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in St. Joseph County, MI reached a record high of 62.50000 in January of 2000 and a record low of 47.39200 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in St. Joseph County, MI - last updated from the United States Federal Reserve on May of 2024.