CHESTERFLD prefixes in area code 636
NANPA records 36 assigned NXX blocks to rate center CHESTERFLD in area code 636, 8.3% of the 435 blocks assigned in the code. A rate center is the billing geography a block is allocated to – NANPA truncates the name to ten characters, so read it as a NANPA label rather than a town. 8 holders hold those blocks, the largest being SOUTHWESTERN BELL (12), T-MOBILE USA, INC. (9), ONVOY, LLC - MO (4). The earliest assignment on record here is 2001-01-18 and the most recent 2026-09-10. 29 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots. The same rate center name also appears in area codes 413, 419, 567, 765 – overlay codes cover the same geography, so a rate center is served by all of them.
Prefixes assigned here
| Prefix | Holder of record | Assigned | Pooled | In service |
|---|---|---|---|---|
| 636-214 | T-Mobile T-MOBILE USA, INC. | 2022-01-11 | yes | yes |
| 636-216 | Onvoy ONVOY, LLC - MO | – | yes | yes |
| 636-236 | T-Mobile T-MOBILE USA, INC. | 2001-05-10 | yes | yes |
| 636-237 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO | – | yes | yes |
| 636-247 | AT&T SOUTHWESTERN BELL | 2002-05-16 | no | yes |
| 636-252 | T-Mobile T-MOBILE USA, INC. | 2021-06-29 | yes | yes |
| 636-262 | T-Mobile T-MOBILE USA, INC. | – | yes | yes |
| 636-268 | Onvoy ONVOY, LLC - MO | 2024-03-21 | yes | yes |
| 636-292 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 2018-04-26 | yes | yes |
| 636-299 | T-Mobile T-MOBILE USA, INC. | – | yes | yes |
| 636-302 | Onvoy ONVOY, LLC - MO | 2026-09-10 | yes | no |
| 636-346 | T-Mobile T-MOBILE USA, INC. | – | yes | yes |
| 636-368 | T-Mobile T-MOBILE USA, INC. | 2001-07-05 | yes | yes |
| 636-449 | Windstream PAETEC ITEL, LLC | – | yes | yes |
| 636-489 | Lumen LEVEL 3 COMMUNICATIONS, LLC - MO | – | yes | yes |
| 636-519 | AT&T SOUTHWESTERN BELL | – | no | yes |
| 636-530 | AT&T SOUTHWESTERN BELL | – | no | yes |
| 636-532 | AT&T SOUTHWESTERN BELL | – | no | yes |
| 636-534 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO | – | yes | yes |
| 636-536 | AT&T SOUTHWESTERN BELL | – | yes | yes |
| 636-537 | AT&T SOUTHWESTERN BELL | – | no | yes |
| 636-579 | T-Mobile T-MOBILE USA, INC. | 2001-01-26 | yes | yes |
| 636-590 | Lumen LEVEL 3 COMMUNICATIONS, LLC - MO | – | yes | yes |
| 636-675 | T-Mobile T-MOBILE USA, INC. | 2001-01-18 | yes | yes |
| 636-681 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - MO | – | yes | yes |
| 636-728 | AT&T SOUTHWESTERN BELL | – | yes | yes |
| 636-730 | AT&T SOUTHWESTERN BELL | – | yes | yes |
| 636-733 | AT&T SOUTHWESTERN BELL | – | yes | yes |
| 636-735 | AT&T SOUTHWESTERN BELL | – | yes | yes |
| 636-736 | AT&T SOUTHWESTERN BELL | – | yes | yes |
| 636-737 | AT&T SOUTHWESTERN BELL | – | no | yes |
| 636-777 | Onvoy ONVOY, LLC - MO | – | yes | yes |
| 636-778 | Charter CHARTER IP ENABLED SERVICES, LLC | – | yes | yes |
| 636-787 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO | – | no | yes |
| 636-812 | Windstream PAETEC ITEL, LLC | – | yes | yes |
| 636-898 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO | – | yes | yes |
The holder is who received the block from the numbering administrator. It is not necessarily the carrier serving a given number: numbers move with their owners, and a pooled block is shared.
Who holds the blocks
| Holder | Brand | Blocks | Share here |
|---|---|---|---|
| SOUTHWESTERN BELL | AT&T | 12 | 33.3% |
| T-MOBILE USA, INC. | T-Mobile | 9 | 25% |
| ONVOY, LLC - MO | Onvoy | 4 | 11.1% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO | Verizon | 4 | 11.1% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - MO | AT&T | 2 | 5.6% |
| PAETEC ITEL, LLC | Windstream | 2 | 5.6% |
| LEVEL 3 COMMUNICATIONS, LLC - MO | Lumen | 2 | 5.6% |
| CHARTER IP ENABLED SERVICES, LLC | Charter | 1 | 2.8% |
Same rate center in other codes
Overlay codes cover the same geography, so one rate center is served by all of them.
Frequently asked
Which prefixes belong to CHESTERFLD in area code 636?
36 blocks: 214, 216, 236, 237, 247, 252, 262, 268, 292, 299, 302, 346 and 24 more, all listed in the table above.
Which carriers have numbers in CHESTERFLD?
SOUTHWESTERN BELL (12 blocks), T-MOBILE USA, INC. (9 blocks), ONVOY, LLC - MO (4 blocks), MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO (4 blocks), TELEPORT COMMUNICATIONS AMERICA, LLC - MO (2 blocks), PAETEC ITEL, LLC (2 blocks). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.
Is CHESTERFLD a city?
It is a rate center – the unit NANPA allocates number blocks to. Its name is abbreviated to ten characters and is not necessarily a settlement: we print it as recorded rather than guess at the full name.