Phone numbers in Fredericktown, Missouri
Fredericktown has 7 phone prefixes in area codes 235, 573.
Biggest holders: Verizon Wireless, Onvoy, Level 3 (Lumen). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 57%
- Local phone company 14%
- Internet / business phone carrier 29%
Every prefix in Fredericktown
Search the first six digits of a number in this list. If it's here, the number started in Fredericktown with the carrier shown. If it isn't, check the Missouri page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 235-529 | Onvoy | Internet / business phone carrier | 2025 |
| 573-440 | Verizon Wireless | Mobile carrier | – |
| 573-444 | Verizon Wireless | Mobile carrier | – |
| 573-561 | Level 3 (Lumen) | Internet / business phone carrier | 2001 |
| 573-783 | AT&T (local phone) | Local phone company | 2001 |
| 573-934 | Verizon Wireless | Mobile carrier | – |
| 573-944 | AT&T Mobility | Mobile carrier | 2006 |
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number. Source: NANPA central office code records, 2026-10-10.