Reference Data Rate Center Directory ACADEMY, SD Rate Center ACADEMY — SD Data last updated: March 10, 2026 LATA 640 State SD Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 43.45659549867818, -99.0795489271867 Area Codes 605 Top Carriers Carrier OCN NXX Count MIDSTATE COMMUNICATIONS, INC. 1670 1
