| District of Missouri area codes: 636 | |
|---|---|
| Country | United States |
| State/Province | Missouri |
| Major City | Saint Louis |
| Time Zone | Central (UTC-06:00) |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 636-875 | Saint Charles | St Peters, MO | Windstream Nuvox Missouri Inc. |
| 636-887 | Saint Charles | Wentzville, MO | Charter Fiberlink |
| 636-888 | Franklin | Saint Clair, MO | Peerless Network Of Missouri |
| 636-891 | Saint Louis | Manchester, MO | Southwestern Bell |
| 636-893 | Saint Louis | Saint Louis, MO | Mci Worldcom Communications, Inc |
| 636-896 | Saint Charles | Saint Charles, MO | Southwestern Bell |
| 636-898 | Saint Louis | Chesterfield, MO | Xo Missouri |
| 636-899 | Saint Charles | Portage Des Sioux, MO | Southwestern Bell |
| 636-916 | Saint Charles | Saint Charles, MO | Southwestern Bell |
| 636-922 | Saint Charles | Harvester, MO | Southwestern Bell |
| 636-923 | Saint Louis | Ladue, MO | Windstream Nuvox Missouri Inc. |
| 636-925 | Saint Charles | Saint Charles, MO | Southwestern Bell |
| 636-926 | Saint Charles | Harvester, MO | Southwestern Bell |
| 636-928 | Saint Charles | Harvester, MO | Southwestern Bell |
| 636-931 | Jefferson | Crystal City, MO | Southwestern Bell |
| 636-932 | Franklin | New Haven, MO | Centurytel Missouri LLC (southwest)dba Centurylink |
| 636-933 | Jefferson | Crystal City, MO | Southwestern Bell |
| 636-936 | Saint Charles | Harvester, MO | Southwestern Bell |
| 636-937 | Jefferson | Crystal City, MO | Southwestern Bell |
| 636-938 | Saint Louis | Eureka, MO | Southwestern Bell |
There are 353 prefixes, In the code area, the major cities are Ballwin, MO;Chesterfield, MO;O'fallon, MO;St. Char. The major city is Saint Louis.