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The city of Fenton is in the state of Missouri. It has the following active area codes:
| NPA | NXX | Usage | Company Name | NXX Introduced Date |
|---|---|---|---|---|
| 636 | 203 | Landline | Mci Worldcom Communications, Inc - Mo | 08/20/2000 |
| 636 | 305 | Landline | Southwestern Bell | 07/22/1999 |
| 636 | 326 | Landline | Southwestern Bell | 07/22/1999 |
| 636 | 343 | Landline | Southwestern Bell | 07/22/1999 |
| 636 | 349 | Landline | Southwestern Bell | 07/22/1999 |
| 636 | 428 | Landline | Teleport Communications Group - St. Louis | 06/16/2015 |
| 636 | 492 | Landline | Mci Worldcom Communications, Inc - Mo | 07/22/1999 |
| 636 | 495 | Landline | Windstream Nuvox Missouri, Llc | 08/19/2013 |
| 636 | 496 | Landline | Southwestern Bell | 10/10/2008 |
| 636 | 533 | Landline | Xo Missouri, Inc. | 03/03/2001 |
| 636 | 660 | Landline | Mcleodusa Telecommunications Services, Inc.- Mo | 08/13/2002 |
| 636 | 678 | Landline | Global Crossing Local Services, Inc.-mo | 07/22/1999 |
| 636 | 692 | Landline | Windstream Nuvox Missouri, Llc | 08/20/2000 |
| 636 | 717 | Landline | Southwestern Bell | 06/13/2000 |
| 636 | 764 | Landline | Level 3 Communications, Llc - Mo | 08/20/2000 |
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