← Area code 304
304-582 phone numbers
Numbers 304-582-0000 to 304-582-9999 are assigned to United States Cellular (rate centre MARTINSBG, WV, NANPA abbreviation). 3 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.