← Area code 620
620-540 phone numbers
Numbers 620-540-0000 to 620-540-9999 are assigned to Telnyx LLC in Howard, KS. 3 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 620-540-3xxx, 620-540-5xxx, 620-540-6xxx, 620-540-7xxx, 620-540-8xxx, 620-540-9xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.