Reference Data Rate Center Directory SIMPSON, IL Rate Center SIMPSON — IL Data last updated: March 10, 2026 LATA 362 State IL Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 37.4678005605006, -88.75615339977338 Area Codes 618 Top Carriers Carrier OCN NXX Count SHAWNEE TEL. CO. 1025 1
