Reference Data Rate Center Directory LONG LAKE, SD Rate Center LONG LAKE — SD Data last updated: March 10, 2026 LATA 640 State SD Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 45.85687251139325, -99.20781481596131 Area Codes 605 Top Carriers Carrier OCN NXX Count VALLEY TELECOM COOP. ASSN., INC. 1685 1
