Reference Data Rate Center Directory WHENDRICKS, SD Rate Center WHENDRICKS — SD Data last updated: March 10, 2026 LATA 620 State SD Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 44.5063046912006, -96.45727672645916 Area Codes 605 Top Carriers Carrier OCN NXX Count INTERSTATE TELECOM COOP, INC. - MN 1654 1
