Resident Population in Calhoun County, MI was 133.78500 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Calhoun County, MI reached a record high of 143.50000 in January of 1978 and a record low of 133.47500 in January of 2022. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Calhoun County, MI - last updated from the United States Federal Reserve on April of 2026.