← Area code 309
309-421 phone numbers
Numbers 309-421-0000 to 309-421-9999 are assigned to Comcast Ip Phone, LLC in Macomb, IL.
Not assigned to any carrier: 309-421-1xxx, 309-421-2xxx, 309-421-4xxx, 309-421-5xxx, 309-421-6xxx, 309-421-7xxx, 309-421-8xxx, 309-421-9xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.