Area code 636: where it is and who calls from it
Area code 636 is in Missouri.
Missouri (St. Charles, Chesterfield, Union, Troy, and parts of east-central Missouri)
| Where | Missouri |
|---|---|
| Time zone | Central Time ยท local time |
| In service since | 1999 |
| Overlay | No |
| Prefixes assigned | 435 of 792 possible (55%) |
Where 636 numbers started
Every prefix is assigned to a rate center, the local calling area it was set up in. These are the biggest in 636, with how many prefixes each has.
Who holds 636 numbers
- Mobile carrier 20%
- Local phone company 37%
- Internet / business phone carrier 40%
- Paging service 1%
- Phone company 2%
| Carrier | Type | Prefixes | Share |
|---|---|---|---|
| AT&T (local phone) | Local phone company | 112 | 26% |
| Brightspeed Of Missouri | Local phone company | 49 | 11% |
| Onvoy | Internet / business phone carrier | 37 | 9% |
| T-Mobile (including Sprint) | Mobile carrier | 35 | 8% |
| AT&T Mobility | Mobile carrier | 29 | 7% |
| Level 3 (Lumen) | Internet / business phone carrier | 29 | 7% |
| MCImetro (Verizon Business) | Internet / business phone carrier | 28 | 6% |
| Windstream (PAETEC) | Internet / business phone carrier | 25 | 6% |
| Verizon Wireless | Mobile carrier | 20 | 5% |
| Charter / Spectrum | Internet / business phone carrier | 18 | 4% |
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.
States served: Missouri.
Other area codes in Missouri
235 314 417 557 573 660 816 975
Got a call from 636?
An area code tells you where a number was first assigned, not where the caller is. People keep their numbers when they move, and scammers can fake any number. If you weren't expecting the call, let it go to voicemail.
If the call shows a 636 number that matches the first six digits of your own, that's often neighbor spoofing. Use the box above to check the full number.
Area code facts from the NANPA area code database (updated 10/06/2026); prefixes and carriers from NANPA's central office code records (updated 2026-10-10). Place description adapted from Wikipedia, CC BY-SA 4.0.