Reference Data Rate Center Directory GEFF, IL Rate Center GEFF — IL Data last updated: March 10, 2026 LATA 978 State IL Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 38.44263171391318, -88.40363087697222 Area Codes 618 Top Carriers Carrier OCN NXX Count WABASH TEL. COOP., INC. 1088 1
