Reference Data Rate Center Directory COLCHESTER, IL Rate Center COLCHESTER — IL Data last updated: March 10, 2026 LATA 977 State IL Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 40.425953316476, -90.793799742362 Area Codes 309 Top Carriers Carrier OCN NXX Count MCDONOUGH TEL. COOP. 1047 1
