← Area code 507
507-550 phone numbers
Numbers 507-550-0000 to 507-550-9999 are assigned to Level 3 Communications, LLC in St. Peter, MN. 5 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 507-550-8xxx, 507-550-9xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.