← Area code 406
406-568 phone numbers
Numbers 406-568-0000 to 406-568-9999 are assigned to Mid-Rivers Tel. Coop., Inc. in Ryegate, MT. 1 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 406-568-3xxx, 406-568-6xxx, 406-568-7xxx, 406-568-8xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.