Reference Data Rate Center Directory LANGFORD, SD Rate Center LANGFORD — SD Data last updated: March 10, 2026 LATA 640 State SD Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 45.60273394572992, -97.83099054438559 Area Codes 605 Top Carriers Carrier OCN NXX Count VENTURE COMMUNICATIONS COOPERATIVE 1680 1
