636 area code is a telephone area code in the North American Numbering Plan (NANP) for the western suburbs of St. Louis and the surrounding areas in the east-central state of Missouri, United States. The area code was created in 1999.
| Area Code | 636 |
|---|---|
| Major City | O'Fallon |
| Service Date | 05/22/1999 |
| Time Zone | Central |
| Overlay Complex | - |
| Location | Missouri (MO) |
| Country | United States |
Some of the cities served by the 636 area code include O'Fallon, St. Charles, St. Peters, Chesterfield, Wildwood, Ballwin, Wentzville, Arnold, Manchester and more.
| Area code | City/Town | County |
|---|---|---|
| 636 | Allenton | St Louis |
| 636 | Arnold | Jefferson |
| 636 | Augusta | St Charles |
| 636 | Ballwin | St Louis |
| 636 | Barnhart | Jefferson |
| 636 | Blackwell | St Francois |
| 636 | Catawissa | Franklin |
| 636 | Cedar Hill | Jefferson |
| 636 | Chesterfield | St Louis |
| 636 | Cottleville | St Charles |
| 636 | Crystal City | Jefferson |
| 636 | De Soto | Jefferson |
| 636 | Defiance | St Charles |
| 636 | Dittmer | Jefferson |
| 636 | Dutzow | Warren |
| 636 | Eureka | St Louis |
| 636 | Fenton | St Louis |
| 636 | Festus | Jefferson |
| 636 | Flinthill | St Charles |
| 636 | Foley | Lincoln |
| 636 | Foristell | St Charles |
| 636 | Gray Summit | Franklin |
| 636 | Grover | St Louis |
| 636 | Grubville | Franklin |
| 636 | Hawk Point | Lincoln |
| 636 | Hematite | Jefferson |
| 636 | Herculaneum | Jefferson |
| 636 | High Hill | Montgomery |
| 636 | High Ridge | Jefferson |
| 636 | Hillsboro | Jefferson |
| 636 | House Springs | Jefferson |
| 636 | Imperial | Jefferson |
| 636 | Jonesburg | Montgomery |
| 636 | Kimmswick | Jefferson |
| 636 | Labadie | Franklin |
| 636 | Lake St Louis | St Charles |
| 636 | Liguori | Jefferson |
| 636 | Lonedell | Franklin |
| 636 | Luebbering | Franklin |
| 636 | Mapaville | Jefferson |
| 636 | Marthasville | Warren |
| 636 | Morse Mill | Jefferson |
| 636 | Moscow Mills | Lincoln |
| 636 | New Melle | St Charles |
| 636 | O'Fallon | St Charles |
| 636 | Old Monroe | Lincoln |
| 636 | Pacific | Franklin |
| 636 | Pevely | Jefferson |
| 636 | Portage Des Sioux | St Charles |
| 636 | Robertsville | Franklin |
| 636 | St Albans | Franklin |
| 636 | St Charles | St Charles |
| 636 | St Clair | Franklin |
| 636 | St Peters | St Charles |
| 636 | Treloar | Warren |
| 636 | Troy | Lincoln |
| 636 | Truxton | Lincoln |
| 636 | Union | Franklin |
| 636 | Valles Mines | St Francois |
| 636 | Villa Ridge | Franklin |
| 636 | Warrenton | Warren |
| 636 | Washington | Franklin |
| 636 | Wentzville | St Charles |
| 636 | West Alton | St Charles |
| 636 | Winfield | Lincoln |
| 636 | Wright City | Warren |