Reference Data GRANT, MT Rate Center GRANT — MT Data last updated: March 10, 2026 LATA 648 State MT Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 45.00853439999999, -113.0669782 Area Codes 406 Top Carriers Carrier OCN NXX Count SOUTHERN MONTANA TEL. CO. 2254 1
