← Area code 573
573-420 phone numbers
Numbers 573-420-0000 to 573-420-9999 are assigned to Windstream Missouri, Inc. in Dixon, MO. 1 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 573-420-1xxx, 573-420-2xxx, 573-420-3xxx, 573-420-4xxx, 573-420-5xxx, 573-420-6xxx, 573-420-7xxx, 573-420-8xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.