Phone numbers in St. Charles, Missouri
St. Charles has 44 phone prefixes in area code 636.
Biggest holders: AT&T (local phone), Onvoy, MCImetro (Verizon Business). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 20%
- Local phone company 25%
- Internet / business phone carrier 45%
- Paging service 2%
- Phone company 7%
Every prefix in St. Charles
Search the first six digits of a number in this list. If it's here, the number started in St. Charles with the carrier shown. If it isn't, check the Missouri page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 636-206 | AT&T Enterprises | Phone company | 2014 |
| 636-219 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 636-233 | Verizon Wireless | Mobile carrier | 2001 |
| 636-246 | Onvoy | Internet / business phone carrier | – |
| 636-255 | AT&T (local phone) | Local phone company | – |
| 636-260 | Onvoy | Internet / business phone carrier | 2024 |
| 636-277 | Peerless Network Of Missouri | Internet / business phone carrier | 2010 |
| 636-288 | AT&T Mobility | Mobile carrier | – |
| 636-301 | Shelcomm | Phone company | 2026 |
| 636-328 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 636-352 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 636-373 | T-Mobile (including Sprint) | Mobile carrier | – |
| 636-389 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 636-395 | AT&T Enterprises | Phone company | – |
| 636-410 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 636-443 | AT&T (local phone) | Local phone company | – |
| 636-448 | AT&T Mobility | Mobile carrier | – |
| 636-487 | Level 3 (Lumen) | Internet / business phone carrier | 2002 |
| 636-493 | Charter / Spectrum | Internet / business phone carrier | – |
| 636-541 | AT&T Mobility | Mobile carrier | 2001 |
| 636-573 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 636-574 | American Messaging Services | Paging service | – |
| 636-578 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 636-627 | Charter / Spectrum | Internet / business phone carrier | 2002 |
| 636-634 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 636-669 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 636-688 | Teleport Communications America | Internet / business phone carrier | – |
| 636-699 | Onvoy | Internet / business phone carrier | – |
| 636-723 | AT&T (local phone) | Local phone company | – |
| 636-724 | AT&T (local phone) | Local phone company | – |
| 636-734 | T-Mobile (including Sprint) | Mobile carrier | – |
| 636-754 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 636-757 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 636-773 | Onvoy | Internet / business phone carrier | – |
| 636-795 | AT&T Mobility | Mobile carrier | – |
| 636-800 | Onvoy | Internet / business phone carrier | 2015 |
| 636-866 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 636-896 | AT&T (local phone) | Local phone company | – |
| 636-916 | AT&T (local phone) | Local phone company | – |
| 636-925 | AT&T (local phone) | Local phone company | – |
| 636-940 | AT&T (local phone) | Local phone company | – |
| 636-946 | AT&T (local phone) | Local phone company | – |
| 636-947 | AT&T (local phone) | Local phone company | – |
| 636-949 | AT&T (local phone) | 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.