Phone numbers in High Ridge, Missouri
High Ridge has 11 phone prefixes in area code 636.
Biggest holders: AT&T (local phone), T-Mobile (including Sprint), Windstream (PAETEC). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 27%
- Local phone company 36%
- Internet / business phone carrier 36%
Every prefix in High Ridge
Search the first six digits of a number in this list. If it's here, the number started in High Ridge with the carrier shown. If it isn't, check the Missouri page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 636-253 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 636-375 | AT&T (local phone) | Local phone company | – |
| 636-376 | AT&T (local phone) | Local phone company | – |
| 636-408 | Onvoy | Internet / business phone carrier | 2024 |
| 636-428 | Teleport Communications America | Internet / business phone carrier | 2015 |
| 636-495 | Windstream (PAETEC) | Internet / business phone carrier | 2013 |
| 636-575 | AT&T Mobility | Mobile carrier | 2001 |
| 636-671 | AT&T (local phone) | Local phone company | – |
| 636-677 | AT&T (local phone) | Local phone company | – |
| 636-692 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 636-829 | T-Mobile (including Sprint) | Mobile carrier | 2019 |
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.