Reference Data Rate Center Directory SUMMERFLD, IL Rate Center SUMMERFLD — IL Data last updated: March 10, 2026 LATA 520 State IL Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 38.598217470841, -89.750897458748 Area Codes 618 Top Carriers Carrier OCN NXX Count FRONTIER NORTH, INC. - IL 1036 1
