| 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 |
|---|---|---|---|
| 636-939 | Saint Charles | Harvester, MO | Southwestern Bell |
| 636-940 | Saint Charles | Saint Charles, MO | Southwestern Bell |
| 636-942 | Jefferson | Antonia, MO | Southwestern Bell |
| 636-944 | Washington | Fletcher, MO | Southwestern Bell |
| 636-946 | Saint Charles | Saint Charles, MO | Southwestern Bell |
| 636-947 | Saint Charles | Saint Charles, MO | Southwestern Bell |
| 636-948 | Jefferson | Antonia, MO | Southwestern Bell |
| 636-949 | Saint Charles | Saint Charles, MO | Southwestern Bell |
| 636-970 | Saint Charles | St Peters, MO | Centurytel Missouri LLC (southwest)dba Centurylink |
| 636-978 | Saint Charles | O Fallon, MO | Centurytel Missouri LLC (southwest)dba Centurylink |
| 636-980 | Saint Charles | O Fallon, MO | Centurytel Missouri LLC (southwest)dba Centurylink |
| 636-987 | Saint Charles | Defiance, MO | Centurytel Missouri LLC (southwest)dba Centurylink |
| 636-555 | Used in movie | Maryland Heights, MO | Used in movie |
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.