Reference Data Rate Center Directory NORTHNAPER, SD Rate Center NORTHNAPER — SD Data last updated: March 10, 2026 LATA 644 State SD Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 42.99881335444649, -99.11631464740968 Area Codes 605 Top Carriers Carrier OCN NXX Count THREE RIVER TELCO 1525 1
