Reference Data Rate Center Directory ONAKA, SD Rate Center ONAKA — SD Data last updated: March 10, 2026 LATA 640 State SD Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 45.19328746488471, -99.46703127984688 Area Codes 605 Top Carriers Carrier OCN NXX Count VENTURE COMMUNICATIONS COOPERATIVE 1680 1
