Phone numbers in Winfield, Missouri
Winfield has 4 phone prefixes in area code 636.
Biggest holders: Level 3 (Lumen), Brightspeed Of Missouri. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 50%
- Internet / business phone carrier 50%
Every prefix in Winfield
Search the first six digits of a number in this list. If it's here, the number started in Winfield with the carrier shown. If it isn't, check the Missouri page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 636-205 | Level 3 (Lumen) | Internet / business phone carrier | 2002 |
| 636-264 | Level 3 (Lumen) | Internet / business phone carrier | 2002 |
| 636-566 | Brightspeed Of Missouri | Local phone company | – |
| 636-668 | Brightspeed Of Missouri | Local phone company | – |
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.