Your Calhoun County Public Health Department works together to enhance our community's total well-being by promoting healthy lifestyles, protecting health, and preventing disease. ... 8 a.m. to 5 p.m. County Building: Fri, 8 a.m.-Noon 269-781-0700 315 W Green St., Marshall, MI 49068. Elected Officials. Board of Commissioners Clerk and Register ....