Reference Data Rate Center Directory SO FORBES, SD Rate Center SO FORBES — SD Data last updated: March 10, 2026 LATA 636 State SD Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 45.93494312680132, -98.77842898062973 Area Codes 605 Top Carriers Carrier OCN NXX Count DICKEY RURAL TEL. COOP. 1611 1
