← Area code 531
531-307 phone numbers
Numbers 531-307-0000 to 531-307-9999 are assigned to Level 3 Communications, LLC in Homer, NE. 1 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 531-307-0xxx, 531-307-2xxx, 531-307-3xxx, 531-307-4xxx, 531-307-5xxx, 531-307-6xxx, 531-307-7xxx, 531-307-9xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.