Law Enforcement Agencies in Mary, SC SC › Horry County Agencies serving the city of Mary in SC. Agency Types in Mary Campus Police 1 agencies Coroners 1 agencies County Jails 1 agencies Municipal Police 1 agencies Sheriff 2 agencies All Agencies in Mary, SC Coastal Carolina Univ Horry County Conway Police Department Horry County Horry County Coroners Office Horry County Horry County PD Horry County Horry County Sheriffs Department Horry County J Reuban Long Detention Center Horry County
