Reference Data Rate Center Directory SO NELVIK, SD Rate Center SO NELVIK — SD Data last updated: March 10, 2026 LATA 638 State SD Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 45.93952769686673, -99.1602178335931 Area Codes 605 Top Carriers Carrier OCN NXX Count DICKEY RURAL TEL. COOP. 1611 1
