Reference Data Rate Center Directory HARDINVL, IL Rate Center HARDINVL — IL Data last updated: March 10, 2026 LATA 978 State IL Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 38.9161551, -87.83697429999997 Area Codes 618 Top Carriers Carrier OCN NXX Count FRONTIER NORTH, INC. - IL 1036 1
