Reference Data Rate Center Directory HARLEM, MT Rate Center HARLEM — MT Data last updated: March 10, 2026 LATA 648 State MT Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 48.53152647289585, -108.7856559478862 Area Codes 406 Top Carriers Carrier OCN NXX Count TRIANGLE TEL. COOP. ASSN., INC. 3310 1
