Reference Data Rate Center Directory PRESHO, SD Rate Center PRESHO — SD Data last updated: March 10, 2026 LATA 640 State SD Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 43.91003042394497, -100.057734479095 Area Codes 605 Top Carriers Carrier OCN NXX Count KENNEBEC TEL. CO. 1668 1
