← Area code 307
307-829 phone numbers
Numbers 307-829-0000 to 307-829-9999 are assigned to Centurylink Communications, LLC in Cheyenne, WY. 6 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 307-829-6xxx, 307-829-8xxx, 307-829-9xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.