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The city of Herculaneum is in the state of Missouri. It has the following active area codes:
| NPA | NXX | Usage | Company Name | NXX Introduced Date |
|---|---|---|---|---|
| 636 | 208 | Wireless | New Cingular Wireless Pcs, Llc - Il | 10/23/2002 |
| 636 | 209 | Wireless | Cellco Partnership Dba Verizon Wireless - Mo | 02/09/2003 |
| 636 | 224 | Landline | Windstream Nuvox Missouri, Llc | 08/20/2000 |
| 636 | 232 | Landline | Level 3 Communications, Llc - Mo | 04/09/2002 |
| 636 | 306 | Wireless | Metro Pcs, Inc. | 07/03/2014 |
| 636 | 465 | Landline | Charter Fiberlink, Llc - Mo | 11/07/2006 |
| 636 | 475 | Landline | Southwestern Bell | 07/22/1999 |
| 636 | 479 | Landline | Southwestern Bell | 07/22/1999 |
| 636 | 524 | Landline | Level 3 Communications, Llc - Mo | 03/13/2002 |
| 636 | 535 | Wireless | Cellco Partnership Dba Verizon Wireless - Mo | 11/10/2014 |
| 636 | 543 | Landline | Teleport Communications Group - St. Louis | 07/08/2009 |
| 636 | 638 | Landline | Charter Fiberlink, Llc - Mo | 05/22/2012 |
| 636 | 725 | Landline | Windstream Nuvox Missouri, Llc | 04/18/2011 |
| 636 | 931 | Landline | Southwestern Bell | 07/22/1999 |
| 636 | 933 | Landline | Southwestern Bell | 07/22/1999 |
| 636 | 937 | Landline | Southwestern Bell | 07/22/1999 |
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