Reference Data Rate Center Directory DOVER, IL Rate Center DOVER — IL Data last updated: March 10, 2026 LATA 368 State IL Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 41.436124532533, -89.39550171953299 Area Codes 815 Top Carriers Carrier OCN NXX Count FRONTIER NORTH, INC. - IL 1015 1
