Town Hall Address 6931 Grass Lake Rd Osseo, MI 49266 United States- Hillsdale County Website https://www.citydirectory.us/township-jefferson-township-county-hillsdale.html Zoning 331-653-5741 6931 Grass Lake Rd Osseo, MI 49266 United States Town Clerk 331-653-5741 6931 Grass Lake Rd Osseo, MI 49266 United States Water 331-653-5741 6931 Grass Lake Rd Osseo, MI 49266 United States Sewer 331-653-5741 6931 Grass Lake Rd Osseo, MI 49266 United States Tax Collector 331-653-5741 6931 Grass Lake Rd Osseo, MI 49266 United States Code Enforcement 517-437-6455 97 North Broad Street Hillsdale, MI 49242 United States Town Hall Hours Call for hours County Hillsdale