Reference Data Rate Center Directory CHINOOK, MT Rate Center CHINOOK — MT Data last updated: March 10, 2026 LATA 648 State MT Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 48.59048767241816, -109.2307276491705 Area Codes 406 Top Carriers Carrier OCN NXX Count TRIANGLE TEL. COOP. ASSN., INC. 2257 1
