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The city of Ballwin is in the state of Missouri. It has the following active area codes:
| NPA | NXX | Usage | Company Name | NXX Introduced Date |
|---|---|---|---|---|
| 636 | 207 | Landline | Southwestern Bell | 07/22/1999 |
| 636 | 207 | Landline | Southwestern Bell | 07/22/1999 |
| 636 | 220 | Landline | Charter Fiberlink, Llc - Mo | 02/09/2003 |
| 636 | 220 | Landline | Charter Fiberlink, Llc - Mo | 02/09/2003 |
| 636 | 227 | Landline | Southwestern Bell | 07/22/1999 |
| 636 | 227 | Landline | Southwestern Bell | 07/22/1999 |
| 636 | 230 | Landline | Southwestern Bell | 07/22/1999 |
| 636 | 230 | Landline | Southwestern Bell | 07/22/1999 |
| 636 | 238 | Landline | Mci Worldcom Communications, Inc - Mo | 07/22/1999 |
| 636 | 238 | Landline | Mci Worldcom Communications, Inc - Mo | 07/22/1999 |
| 636 | 256 | Landline | Southwestern Bell | 07/22/1999 |
| 636 | 256 | Landline | Southwestern Bell | 07/22/1999 |
| 636 | 386 | Landline | Southwestern Bell | 07/22/1999 |
| 636 | 386 | Landline | Southwestern Bell | 07/22/1999 |
| 636 | 391 | Landline | Southwestern Bell | 07/22/1999 |
| 636 | 391 | Landline | Southwestern Bell | 07/22/1999 |
| 636 | 394 | Landline | Southwestern Bell | 07/22/1999 |
| 636 | 394 | Landline | Southwestern Bell | 07/22/1999 |
| 636 | 399 | Wireless | Cellco Partnership Dba Verizon Wireless - Mo | 10/13/1999 |
| 636 | 399 | Wireless | Cellco Partnership Dba Verizon Wireless - Mo | 10/13/1999 |
| 636 | 412 | Landline | Xo Missouri, Inc. | 03/03/2001 |
| 636 | 412 | Landline | Xo Missouri, Inc. | 03/03/2001 |
| 636 | 438 | Landline | Allegiance Telecom, Inc. - Mo | 08/20/2000 |
| 636 | 438 | Landline | Allegiance Telecom, Inc. - Mo | 08/20/2000 |
| 636 | 484 | Wireless | Cellco Partnership Dba Verizon Wireless - Mo | 08/20/2000 |
| 636 | 484 | Wireless | Cellco Partnership Dba Verizon Wireless - Mo | 08/20/2000 |
| 636 | 527 | Landline | Southwestern Bell | 07/22/1999 |
| 636 | 527 | Landline | Southwestern Bell | 07/22/1999 |
| 636 | 552 | Landline | Level 3 Communications, Llc - Mo | 08/20/2000 |
| 636 | 552 | Landline | Level 3 Communications, Llc - Mo | 08/20/2000 |
| 636 | 557 | Landline | Allegiance Telecom, Inc. - Mo | 08/20/2000 |
| 636 | 557 | Landline | Allegiance Telecom, Inc. - Mo | 08/20/2000 |
| 636 | 591 | Landline | Mcleodusa Telecommunications Services, Inc.- Mo | 03/03/2001 |
| 636 | 591 | Landline | Mcleodusa Telecommunications Services, Inc.- Mo | 03/03/2001 |
| 636 | 594 | Landline | Xo Missouri, Inc. | 03/03/2001 |
| 636 | 594 | Landline | Xo Missouri, Inc. | 03/03/2001 |
| 636 | 751 | Wireless | Cellco Partnership Dba Verizon Wireless - Mo | 10/13/1999 |
| 636 | 751 | Wireless | Cellco Partnership Dba Verizon Wireless - Mo | 10/13/1999 |
| 636 | 891 | Landline | Southwestern Bell | 07/22/1999 |
| 636 | 891 | Landline | Southwestern Bell | 07/22/1999 |
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