| 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 |
|---|---|---|---|
| 636-200 | Saint Louis | Maryland Heights, MO | Birch Telecom Of Missouri |
| 636-203 | Saint Louis | Fenton, MO | Mci Worldcom Communications, Inc |
| 636-205 | Lincoln | Winfield, MO | Level 3 Communications |
| 636-206 | Saint Louis | Earth City, MO | Sbc Internet Services |
| 636-207 | Saint Louis | Manchester, MO | Southwestern Bell |
| 636-208 | Jefferson | Crystal City, MO | New Cingular Wireless PCS - IL |
| 636-209 | Jefferson | Crystal City, MO | Cellco Partnership DBA Verizon Wireless |
| 636-212 | Jefferson | Maxville, MO | Cellco Partnership DBA Verizon Wireless |
| 636-216 | Saint Louis | Saint Louis, MO | Xo Missouri |
| 636-219 | Saint Charles | Saint Charles, MO | T-mobile Usa |
| 636-220 | Saint Louis | Manchester, MO | Charter Fiberlink |
| 636-221 | Franklin | Washington, MO | Southwestern Bell |
| 636-222 | Jefferson | Cedar Hill, MO | Cellco Partnership DBA Verizon Wireless |
| 636-223 | Jefferson | Imperial, MO | AT&T Local |
| 636-224 | Jefferson | Herculaneum, MO | Windstream Nuvox Missouri Inc. |
| 636-225 | Saint Louis | Valley Park, MO | Southwestern Bell |
| 636-226 | Saint Louis | Valley Park, MO | Southwestern Bell |
| 636-227 | Saint Louis | Manchester, MO | Southwestern Bell |
| 636-228 | Saint Charles | Augusta, MO | Centurytel Missouri LLC (southwest)dba Centurylink |
| 636-229 | Saint Charles | Harvester, MO | Mci Worldcom Communications, Inc |
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.