Law Enforcement Agencies in McElroys Mill, GA GA › Rockdale County Agencies serving the city of McElroys Mill in GA. Agency Types in McElroys Mill Coroners 1 agencies County Jails 1 agencies Municipal Police 1 agencies Sheriff 1 agencies All Agencies in McElroys Mill, GA Conyers Police Department Rockdale County Rockdale County Coroners Office Rockdale County Rockdale County Jail Rockdale County Rockdale County Sheriffs Office Rockdale County