Reference Data Rate Center Directory OPHEIM, MT Rate Center OPHEIM — MT Data last updated: March 10, 2026 LATA 650 State MT Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 48.85799130624322, -106.4100519671263 Area Codes 406 Top Carriers Carrier OCN NXX Count NEMONT TEL COOP INC 2247 1
