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← Area code 423

423-604 phone numbers

Numbers 423-604-0000 to 423-604-9999 are assigned to Onvoy, LLC in Etowah, TN. 6 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 423-604-2xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 423-604