Reference Data Rate Center Directory SOUTH LADD, SD Rate Center SOUTH LADD — SD Data last updated: March 10, 2026 LATA 638 State SD Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 45.93316561342604, -103.4439280780796 Area Codes 605 Top Carriers Carrier OCN NXX Count CONSOLIDATED TELCOM 1607 1
