Reference Data Rate Center Directory SUMMIT, SD Rate Center SUMMIT — SD Data last updated: March 10, 2026 LATA 640 State SD Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 45.30467217283082, -97.03670299546127 Area Codes 605 Top Carriers Carrier OCN NXX Count RC TECHNOLOGIES 1674 1
