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← Area code 406

406-520 phone numbers

Numbers 406-520-0000 to 406-520-9999 are assigned to Hd Carrier LLC in Absarokee, MT. 2 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 406-520-2xxx, 406-520-3xxx, 406-520-4xxx, 406-520-7xxx, 406-520-8xxx, 406-520-9xxx — calls from these use spoofed caller IDs.

Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.

Reported numbers in 406-520