Law Enforcement Agencies in Frontier, MI MI › Hillsdale County Agencies serving the city of Frontier in MI. Agency Types in Frontier Campus Police 1 agencies County Jails 1 agencies Municipal Police 1 agencies Sheriff 1 agencies All Agencies in Frontier, MI Hillsdale College Hillsdale County Hillsdale County Jail Hillsdale County Hillsdale County Sheriffs Office Hillsdale County Hillsdale Police Department Hillsdale County
