Area Code 636
Area code 636 is in Missouri, USA , spanning 8 counties and serving 66 cities, including O'Fallon, St Charles or St Peters; it currently uses 427 prefixes, assigned from 636-200-XXXX through 636-999-XXXX.
In service date for area code 636: May 22, 1999.
The current local time is .
For exact NPA boundaries see official 636 area code map
Phone number lookup
More Missouri area codes:
Locate any 636-NXX prefix:
| NPANXX | Area Served1 | Date2 |
|---|---|---|
| 636-200 | Manchester | N/A |
| 636-201 | Warrenton | 8/17/2020 |
| 636-202 | Warrenton | 9/18/2018 |
| 636-203 | Fenton | N/A |
| 636-204 | Warrenton | 6/17/2021 |
| 636-205 | Winfield | 8/16/2002 |
| 636-206 | St Charles | 3/28/2014 |
| 636-207 | Manchester | N/A |
| 636-208 | Festus/ Crystal City | 10/23/2002 |
| 636-209 | Festus/ Crystal City | N/A |
| 636-210 | Union | 9/29/2020 |
| 636-212 | Maxville | 10/28/2002 |
| 636-213 | Warrenton | 1/11/2022 |
| 636-214 | Chesterfield | 1/11/2022 |
| 636-215 | Maxville | 1/7/2016 |
| 636-216 | Chesterfield | 6/3/2004 |
| 636-218 | Maxville | 5/26/2021 |
| 636-219 | St Charles | 2/2/2001 |
| 636-220 | Manchester | N/A |
| 636-221 | Washington | 5/14/2002 |
| 636-222 | Cedar Hill | 10/28/2002 |
| 636-223 | Imperial | 1/29/2002 |
| 636-224 | Herculaneum/ Pevely | N/A |
| 636-225 | Valley Park | N/A |
| 636-226 | Valley Park | N/A |
| 636-227 | Manchester | N/A |
| 636-228 | Augusta | N/A |
| 636-229 | Harvester | N/A |
| 636-230 | Manchester | N/A |
| 636-231 | Washington | 4/9/2002 |
| 636-232 | Festus/ Crystal City | 4/9/2002 |
| 636-233 | St Charles | 11/6/2001 |
| 636-234 | Union | 4/9/2002 |
| 636-235 | Warrenton | 4/9/2002 |
| 636-236 | Chesterfield | 5/10/2001 |
| 636-237 | Chesterfield | N/A |
| 636-238 | Manchester | N/A |
| 636-239 | Washington | N/A |
| 636-240 | O'Fallon | N/A |
| 636-241 | Washington | 8/3/2022 |
| 636-242 | Marthasville | 10/12/2006 |
| 636-243 | De Soto | 4/9/2002 |
| 636-244 | Harvester | 8/8/2001 |
| 636-245 | Maxville | 9/21/2020 |
| 636-246 | St Charles | 4/2/2004 |
| 636-247 | Chesterfield | 5/16/2002 |
| 636-248 | St Peters | N/A |
| 636-249 | Union | 7/3/2014 |
| 636-250 | Orchard Farm | N/A |
| 636-251 | Foristell | N/A |
| 636-252 | Chesterfield | 6/29/2021 |
| 636-253 | High Ridge | 5/7/2001 |
| 636-254 | Manchester | 02/23/2024 |
| 636-255 | St Charles | N/A |
| 636-256 | Manchester | N/A |
| 636-257 | Pacific | N/A |
| 636-258 | Orchard Farm | N/A |
| 636-259 | Gray Summit | 5/7/2001 |
| 636-260 | St Charles | 02/26/2024 |
| 636-261 | Harvester | 4/14/2003 |
| 636-262 | Chesterfield | N/A |
| 636-263 | Harvester | 10/18/2001 |
| 636-264 | Winfield | 5/16/2002 |
| 636-265 | Dardenne | 8/8/2001 |
| 636-266 | Washington | 2/28/2002 |
| 636-267 | Antonia | 02/01/2024 |
| 636-268 | Chesterfield | 03/21/2024 |
| 636-269 | Maxville | 03/21/2024 |
| 636-270 | Ware | 3/11/2021 |
| 636-271 | Pacific | N/A |
| 636-272 | O'Fallon | N/A |
| 636-273 | Pond | N/A |
| 636-274 | Cedar Hill | N/A |
| 636-275 | Maxville | 2/11/2015 |
| 636-276 | St Clair | 06/12/2024 |
| 636-277 | St Charles | 3/8/2010 |
| 636-278 | St Peters | N/A |
| 636-279 | St Peters | N/A |
| 636-280 | Eureka | 3/11/2021 |
| 636-281 | O'Fallon | N/A |
| 636-282 | Maxville | N/A |
| 636-283 | Washington | 6/6/2007 |
| 636-284 | Harvester | 5/15/2002 |
| 636-285 | Cedar Hill | N/A |
| 636-286 | Union | 12/17/2024 |
| 636-287 | Maxville | N/A |
| 636-288 | St Charles | N/A |
| 636-289 | Hawk Point | 2/1/2022 |
| 636-290 | Troy | 8/9/2002 |
| 636-292 | Chesterfield | 4/26/2018 |
| 636-293 | O'Fallon | 8/9/2002 |
| 636-294 | O'Fallon | 8/8/2001 |
| 636-295 | Troy | N/A |
| 636-296 | Maxville | N/A |
| 636-297 | Warrenton | N/A |
| 636-299 | Chesterfield | N/A |
| NPANXX | Area Served1 | Date2 |
|---|---|---|
| 636-300 | Harvester | 5/1/2001 |
| 636-303 | Union | 3/23/2017 |
| 636-305 | Fenton | N/A |
| 636-306 | Herculaneum/ Pevely | 7/3/2014 |
| 636-310 | Hillsboro | 4/5/2016 |
| 636-312 | O'Fallon | 11/6/2015 |
| 636-317 | Harvester | 2/18/2016 |
| 636-318 | Troy | N/A |
| 636-319 | Dardenne | 5/14/2020 |
| 636-320 | Harvester | N/A |
| 636-321 | Maxville | N/A |
| 636-322 | St Clair | 1/10/2006 |
| 636-323 | Antonia | 1/10/2003 |
| 636-324 | Pond | 3/5/2007 |
| 636-326 | Fenton | N/A |
| 636-327 | Wentzville | N/A |
| 636-328 | St Charles | N/A |
| 636-329 | Harvester | 5/1/2001 |
| 636-330 | De Soto | 3/6/2019 |
| 636-331 | Festus/ Crystal City | 8/9/2017 |
| 636-332 | Wentzville | N/A |
| 636-333 | Maxville | N/A |
| 636-334 | Pacific | 1/10/2003 |
| 636-335 | Fenton | 7/27/2020 |
| 636-336 | Harvester | N/A |
| 636-337 | De Soto | N/A |
| 636-338 | Hawk Point | N/A |
| 636-339 | O'Fallon | 8/25/2020 |
| 636-341 | Festus/ Crystal City | 4/28/2021 |
| 636-342 | Harvester | 12/22/2021 |
| 636-343 | Fenton | N/A |
| 636-344 | Harvester | 5/24/2005 |
| 636-345 | Harvester | N/A |
| 636-346 | Chesterfield | N/A |
| 636-347 | De Soto | 5/14/2021 |
| 636-348 | St Peters | 9/1/2020 |
| 636-349 | Fenton | N/A |
| 636-351 | Ofallon | 1/9/2022 |
| 636-352 | St Charles | N/A |
| 636-354 | Harvester | 8/16/2021 |
| 636-355 | Foley | 1/10/2007 |
| 636-356 | Moscow Mills | N/A |
| 636-357 | Wentzville | N/A |
| 636-358 | Troy | N/A |
| 636-359 | Warrenton | N/A |
| 636-362 | Harvester | 4/18/2013 |
| 636-363 | Maxville | N/A |
| 636-364 | St Clair | 1/10/2003 |
| 636-366 | Moscow Mills | N/A |
| 636-367 | Troy | 03/08/2023 |
| 636-368 | Chesterfield | 7/5/2001 |
| 636-369 | Washington | 3/11/2021 |
| 636-373 | St Charles | N/A |
| 636-375 | High Ridge | N/A |
| 636-376 | High Ridge | N/A |
| 636-377 | Warrenton | 10/12/2006 |
| 636-378 | St Peters | 07/28/2023 |
| 636-379 | O'Fallon | N/A |
| 636-380 | Troy | 02/16/2024 |
| 636-383 | Troy | 7/3/2014 |
| 636-384 | Wright City | N/A |
| 636-385 | O'Fallon | 2/25/2011 |
| 636-386 | Manchester | N/A |
| 636-387 | St Peters | 8/8/2001 |
| 636-388 | Union | 2/28/2002 |
| 636-389 | St Charles | N/A |
| 636-390 | Washington | N/A |
| 636-391 | Manchester | N/A |
| 636-392 | Washington | 6/3/2008 |
| 636-393 | Pacific | 12/13/2004 |
| 636-394 | Manchester | N/A |
| 636-395 | St Charles | N/A |
| 636-396 | Festus/ Crystal City | 03/13/2024 |
| 636-397 | St Peters | N/A |
| 636-398 | New Melle | N/A |
| 636-399 | Manchester | N/A |
| NPANXX | Area Served1 | Date2 |
|---|---|---|
| 636-400 | Portage Des Sioux | N/A |
| 636-402 | Gray Summit | 7/5/2001 |
| 636-403 | Harvester | N/A |
| 636-405 | Pond | N/A |
| 636-406 | Cedar Hill | 03/21/2024 |
| 636-407 | De Soto | 03/21/2024 |
| 636-408 | High Ridge | 03/21/2024 |
| 636-409 | O'Fallon | 1/5/2016 |
| 636-410 | St Charles | N/A |
| 636-412 | Valley Park | N/A |
| 636-415 | Harvester | 04/16/2024 |
| 636-422 | Pond | 5/11/2005 |
| 636-424 | Pond | 03/29/2024 |
| 636-425 | Portage Des Sioux | N/A |
| 636-426 | Portage Des Sioux | 5/10/2001 |
| 636-427 | St Peters | 01/07/2025 |
| 636-428 | High Ridge | 6/16/2015 |
| 636-429 | Eureka | 2/1/2013 |
| 636-430 | Foristell | 05/05/2025 |
| 636-431 | Valley Park | N/A |
| 636-432 | Washington | 1/10/2006 |
| 636-433 | Marthasville | N/A |
| 636-434 | Portage Des Sioux | 7/5/2001 |
| 636-435 | Valley Park | N/A |
| 636-438 | Manchester | N/A |
| 636-439 | O'Fallon | 1/14/2011 |
| 636-441 | Harvester | N/A |
| 636-442 | Harvester | N/A |
| 636-443 | St Charles | N/A |
| 636-444 | Valley Park | N/A |
| 636-445 | Wentzville | 11/13/2012 |
| 636-447 | Harvester | N/A |
| 636-448 | St Charles | N/A |
| 636-449 | Chesterfield | N/A |
| 636-450 | Harvester | 05/09/2025 |
| 636-451 | Gray Summit | N/A |
| 636-452 | Ware | N/A |
| 636-456 | Warrenton | N/A |
| 636-458 | Pond | N/A |
| 636-459 | Foristell | N/A |
| 636-461 | Imperial | N/A |
| 636-462 | Troy | N/A |
| 636-463 | Foristell | N/A |
| 636-464 | Imperial | N/A |
| 636-465 | Festus/ Crystal City | 11/7/2006 |
| 636-466 | Wentzville | 3/28/2008 |
| 636-467 | Imperial | N/A |
| 636-474 | O'Fallon | N/A |
| 636-475 | Herculaneum/ Pevely | N/A |
| 636-477 | Harvester | N/A |
| 636-479 | Herculaneum/ Pevely | N/A |
| 636-481 | Hillsboro | 7/5/2001 |
| 636-482 | Augusta | N/A |
| 636-484 | Manchester | N/A |
| 636-485 | St Peters | N/A |
| 636-486 | Harvester | 8/26/2002 |
| 636-487 | St Charles | 8/26/2002 |
| 636-488 | Jonesburg | N/A |
| 636-489 | Chesterfield | N/A |
| 636-492 | Fenton | N/A |
| 636-493 | St Charles | N/A |
| 636-495 | High Ridge | 8/19/2013 |
| 636-496 | Fenton | 10/10/2008 |
| 636-497 | Wentzville | N/A |
| 636-498 | Harvester | N/A |
| NPANXX | Area Served1 | Date2 |
|---|---|---|
| 636-500 | Imperial | N/A |
| 636-515 | O'Fallon | 1/27/2014 |
| 636-517 | Valley Park | 7/5/2001 |
| 636-519 | Chesterfield | N/A |
| 636-524 | Festus/ Crystal City | 3/13/2002 |
| 636-525 | Imperial | 7/5/2001 |
| 636-527 | Manchester | N/A |
| 636-528 | Troy | N/A |
| 636-529 | Valley Park | N/A |
| 636-530 | Chesterfield | N/A |
| 636-532 | Chesterfield | N/A |
| 636-533 | Fenton | N/A |
| 636-534 | Chesterfield | N/A |
| 636-535 | Festus/ Crystal City | 11/10/2014 |
| 636-536 | Chesterfield | N/A |
| 636-537 | Chesterfield | N/A |
| 636-538 | Wentzville | N/A |
| 636-541 | St Charles | 6/8/2001 |
| 636-542 | O'Fallon | 6/19/2007 |
| 636-543 | Festus/ Crystal City | 7/8/2009 |
| 636-544 | O'Fallon | 3/20/2002 |
| 636-547 | Imperial | N/A |
| 636-548 | Maxville | N/A |
| 636-549 | Eureka | N/A |
| 636-551 | Cedar Hill | 3/17/2014 |
| 636-552 | Manchester | N/A |
| 636-556 | Valley Park | N/A |
| 636-557 | Manchester | N/A |
| 636-561 | Dardenne | N/A |
| 636-565 | De Soto | 2/27/2002 |
| 636-566 | Winfield | N/A |
| 636-573 | St Charles | N/A |
| 636-574 | St Charles | N/A |
| 636-575 | High Ridge | 11/12/2001 |
| 636-577 | St Peters | 3/20/2002 |
| 636-578 | St Charles | 2/2/2001 |
| 636-579 | Chesterfield | 1/26/2001 |
| 636-582 | Union | 6/5/2008 |
| 636-583 | Union | N/A |
| 636-584 | Union | N/A |
| 636-585 | High Hill | N/A |
| 636-586 | De Soto | N/A |
| 636-587 | Eureka | N/A |
| 636-589 | Warrenton | 11/15/2022 |
| 636-590 | Chesterfield | N/A |
| 636-591 | Manchester | N/A |
| 636-594 | Manchester | N/A |
| 636-597 | Truxton | N/A |
| NPANXX | Area Served1 | Date2 |
|---|---|---|
| 636-600 | Fenton | N/A |
| 636-614 | O'Fallon | 10/8/2001 |
| 636-622 | Troy | N/A |
| 636-625 | Dardenne | N/A |
| 636-626 | St Peters | 9/6/2018 |
| 636-627 | St Charles | 6/7/2002 |
| 636-628 | Manchester | N/A |
| 636-629 | St Clair | N/A |
| 636-630 | O'Fallon | 5/19/2022 |
| 636-633 | Imperial | 5/7/2001 |
| 636-634 | St Charles | N/A |
| 636-635 | Cedar Hill | 6/4/2021 |
| 636-637 | Festus/ Crystal City | 9/3/2019 |
| 636-638 | Festus/ Crystal City | 5/22/2012 |
| 636-639 | Wentzville | N/A |
| 636-642 | Imperial | N/A |
| 636-648 | Portage Des Sioux | N/A |
| 636-649 | Union | 10/27/2011 |
| 636-651 | Fenton | N/A |
| 636-655 | Wentzville | 9/8/2021 |
| 636-660 | Fenton | 8/13/2002 |
| 636-661 | Old Monroe | N/A |
| 636-662 | Foley | N/A |
| 636-665 | Old Monroe | N/A |
| 636-666 | Union | 12/24/2018 |
| 636-667 | Washington | 1/16/2002 |
| 636-668 | Winfield | N/A |
| 636-669 | St Charles | N/A |
| 636-671 | High Ridge | N/A |
| 636-673 | Foristell | N/A |
| 636-674 | Antonia | N/A |
| 636-675 | Chesterfield | 1/18/2001 |
| 636-677 | High Ridge | N/A |
| 636-678 | Fenton | N/A |
| 636-679 | Wentzville | N/A |
| 636-680 | Fenton | N/A |
| 636-681 | Chesterfield | N/A |
| 636-685 | Harvester | N/A |
| 636-686 | Manchester | N/A |
| 636-688 | St Charles | N/A |
| 636-689 | Valley Park | N/A |
| 636-692 | High Ridge | N/A |
| 636-695 | Dardenne | N/A |
| 636-696 | O'Fallon | N/A |
| 636-697 | St Peters | N/A |
| 636-698 | Wentzville | N/A |
| 636-699 | St Charles | N/A |
| NPANXX | Area Served1 | Date2 |
|---|---|---|
| 636-706 | St Peters | 9/20/2013 |
| 636-707 | Cedar Hill | 12/7/2004 |
| 636-717 | Fenton | N/A |
| 636-720 | Harvester | N/A |
| 636-722 | Harvester | N/A |
| 636-723 | St Charles | N/A |
| 636-724 | St Charles | N/A |
| 636-725 | Festus/ Crystal City | 4/18/2011 |
| 636-728 | Chesterfield | N/A |
| 636-730 | Chesterfield | N/A |
| 636-732 | Gray Summit | 10/24/2019 |
| 636-733 | Chesterfield | N/A |
| 636-734 | St Charles | N/A |
| 636-735 | Chesterfield | N/A |
| 636-736 | Chesterfield | N/A |
| 636-737 | Chesterfield | N/A |
| 636-741 | Imperial | N/A |
| 636-742 | Gray Summit | N/A |
| 636-744 | Union | 3/28/2006 |
| 636-745 | Wright City | N/A |
| 636-746 | Maxville | 2/4/2022 |
| 636-747 | Pacific | 1/5/2016 |
| 636-748 | Cedar Hill | 3/5/2007 |
| 636-751 | Manchester | N/A |
| 636-753 | Portage Des Sioux | N/A |
| 636-754 | St Charles | N/A |
| 636-755 | Dardenne | 1/20/2005 |
| 636-757 | St Charles | N/A |
| 636-758 | St Clair | 10/25/2019 |
| 636-764 | Fenton | N/A |
| 636-773 | St Charles | 4/9/2004 |
| 636-775 | Troy | 2/7/2011 |
| 636-777 | Chesterfield | N/A |
| 636-778 | Chesterfield | N/A |
| 636-779 | Manchester | N/A |
| 636-782 | Holstein | 1/10/2007 |
| 636-787 | Chesterfield | N/A |
| 636-789 | Hillsboro | N/A |
| 636-791 | Wright City | 1/10/2007 |
| 636-793 | Harvester | N/A |
| 636-794 | Harvester | N/A |
| 636-795 | St Charles | N/A |
| 636-797 | Hillsboro | N/A |
| 636-798 | Defiance | N/A |
| NPANXX | Area Served1 | Date2 |
|---|---|---|
| 636-800 | St Charles | 10/14/2015 |
| 636-812 | Chesterfield | N/A |
| 636-821 | Pond | N/A |
| 636-825 | Valley Park | N/A |
| 636-827 | Valley Park | N/A |
| 636-828 | New Melle | N/A |
| 636-829 | High Ridge | 2/6/2019 |
| 636-837 | Herculaneum/ Pevely | 12/22/2020 |
| 636-841 | Wentzville | N/A |
| 636-849 | O'Fallon | 4/6/2017 |
| 636-851 | Harvester | 7/5/2001 |
| 636-856 | Wentzville | 1/23/2008 |
| 636-861 | Valley Park | N/A |
| 636-865 | Hillsboro | 3/24/2017 |
| 636-866 | St Charles | N/A |
| 636-867 | Jonesburg | 1/11/2022 |
| 636-874 | O'Fallon | 2/17/2022 |
| 636-875 | St Peters | 7/6/2007 |
| 636-887 | Wentzville | 12/13/2004 |
| 636-888 | St Clair | 1/21/2014 |
| 636-891 | Manchester | N/A |
| 636-893 | Manchester | N/A |
| 636-896 | St Charles | N/A |
| 636-898 | Chesterfield | N/A |
| 636-899 | Portage Des Sioux | N/A |
| NPANXX | Area Served1 | Date2 |
|---|---|---|
| 636-900 | Washington | 10/14/2015 |
| 636-916 | St Charles | N/A |
| 636-922 | Harvester | N/A |
| 636-923 | Valley Park | N/A |
| 636-925 | St Charles | N/A |
| 636-926 | Harvester | N/A |
| 636-928 | Harvester | N/A |
| 636-931 | Festus/ Crystal City | N/A |
| 636-932 | Holstein | N/A |
| 636-933 | Festus/ Crystal City | N/A |
| 636-936 | Harvester | N/A |
| 636-937 | Festus/ Crystal City | N/A |
| 636-938 | Eureka | N/A |
| 636-939 | Harvester | N/A |
| 636-940 | St Charles | N/A |
| 636-942 | Antonia | N/A |
| 636-944 | Ware | N/A |
| 636-946 | St Charles | N/A |
| 636-947 | St Charles | N/A |
| 636-948 | Antonia | N/A |
| 636-949 | St Charles | N/A |
| 636-970 | St Peters | N/A |
| 636-978 | O'Fallon | N/A |
| 636-980 | O'Fallon | N/A |
| 636-987 | Defiance | N/A |
| 636-999 | Pacific | 3/20/2015 |
- For 'Area served' we list the rate center. In the North American Numbering Plan a rate center is a geographic area used to determine local calling boundaries for billing purposes. Its name is generally a locality, often not the only one served by an NPA-NXX combination.
- Assignment date. N/A - mostly central office codes assigned before 2001.
- NXX prefixes last updated: June 3, 2025
Cities in area code 636
| City1 | County | Time Zone2 |
|---|---|---|
| Allenton | St Louis | C |
| Arnold | Jefferson | C |
| Augusta | St Charles | C |
| Ballwin | St Louis | C |
| Barnhart | Jefferson | C |
| Blackwell | St Francois | C |
| Catawissa | Franklin | C |
| Cedar Hill | Jefferson | C |
| Chesterfield | St Louis | C |
| Cottleville | St Charles | C |
| Crystal City | Jefferson | C |
| De Soto | Jefferson | C |
| Defiance | St Charles | C |
| Dittmer | Jefferson | C |
| Dutzow | Warren | C |
| Eureka | St Louis | C |
| Fenton | St Louis | C |
| Festus | Jefferson | C |
| Flinthill | St Charles | C |
| Foley | Lincoln | C |
| Foristell | St Charles | C |
| Gray Summit | Franklin | C |
| Grover | St Louis | C |
| Grubville | Franklin | C |
| Hawk Point | Lincoln | C |
| Hematite | Jefferson | C |
| Herculaneum | Jefferson | C |
| High Hill | Montgomery | C |
| High Ridge | Jefferson | C |
| Hillsboro | Jefferson | C |
| House Springs | Jefferson | C |
| Imperial | Jefferson | C |
| Jonesburg | Montgomery | C |
| Kimmswick | Jefferson | C |
| Labadie | Franklin | C |
| Lake St Louis | St Charles | C |
| Liguori | Jefferson | C |
| Lonedell | Franklin | C |
| Luebbering | Franklin | C |
| Mapaville | Jefferson | C |
| Marthasville | Warren | C |
| Morse Mill | Jefferson | C |
| Moscow Mills | Lincoln | C |
| New Melle | St Charles | C |
| O'Fallon | St Charles | C |
| Old Monroe | Lincoln | C |
| Pacific | Franklin | C |
| Pevely | Jefferson | C |
| Portage Des Sioux | St Charles | C |
| Robertsville | Franklin | C |
| St Albans | Franklin | C |
| St Charles | St Charles | C |
| St Clair | Franklin | C |
| St Peters | St Charles | C |
| Treloar | Warren | C |
| Troy | Lincoln | C |
| Truxton | Lincoln | C |
| Union | Franklin | C |
| Valles Mines | St Francois | C |
| Villa Ridge | Franklin | C |
| Warrenton | Warren | C |
| Washington | Franklin | C |
| Wentzville | St Charles | C |
| West Alton | St Charles | C |
| Winfield | Lincoln | C |
| Wright City | Warren | C |
- Listed above are most places served by USA area code 636. When multiple places in a US state share the same name we list the largest one only. Cities with population over 50,000 are displayed in bold text.
- C stands for Central Time (currently ).