Reference Data Rate Center Directory HARMONY, IL Rate Center HARMONY — IL Data last updated: March 10, 2026 LATA 520 State IL Area Codes 1 Exchanges (NXX) 2 Carriers 1 Coordinates 38.40750271093375, -88.793148497027 Area Codes 618 Top Carriers Carrier OCN NXX Count ILLINOIS BELL TEL CO 9329 2
