Resident Population in St. Joseph County, IN was 272.84800 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in St. Joseph County, IN reached a record high of 272.84800 in January of 2023 and a record low of 238.06300 in January of 1983. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in St. Joseph County, IN - last updated from the United States Federal Reserve on May of 2024.