Reference Data Rate Center Directory CALHOUN, IL Rate Center CALHOUN — IL Data last updated: March 10, 2026 LATA 978 State IL Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 38.6498824404089, -88.04409236089214 Area Codes 618 Top Carriers Carrier OCN NXX Count FRONTIER NORTH, INC. - IL 1036 1
