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The city of Porterville is in the state of California. It has the following active area codes:
| NPA | NXX | Usage | Company Name | NXX Introduced Date |
|---|---|---|---|---|
| 559 | 202 | Landline | O1 Communications, Inc. - Ca | 05/10/1999 |
| 559 | 204 | Wireless | American Messaging Services, Llc | 11/20/1998 |
| 559 | 306 | Landline | Matrix Telecom, Llc. Sii Tnci - Ca | 01/29/2002 |
| 559 | 310 | Wireless | New Cingular Wireless Pcs, Llc | 12/26/2001 |
| 559 | 333 | Wireless | Sprint Spectrum L.p. | 03/03/2001 |
| 559 | 339 | Landline | Arrival Communications, Inc. - Ca | 06/30/2001 |
| 559 | 350 | Wireless | T-mobile Usa, Inc. | 02/21/2002 |
| 559 | 359 | Wireless | New Cingular Wireless Pcs, Llc | 02/27/1999 |
| 559 | 361 | Wireless | New Cingular Wireless Pcs, Llc | 07/22/1999 |
| 559 | 502 | Wireless | American Messaging Services, Llc | 07/22/1999 |
| 559 | 534 | Landline | Ducor Telephone Co. | 11/20/1998 |
| 559 | 544 | Landline | Teleport Communications Group - San Francisco | 03/12/2010 |
| 559 | 560 | Landline | Matrix Telecom, Llc. Sii Tnci - Ca | 05/10/1999 |
| 559 | 615 | Landline | Charter Fiberlink Ca-cco, Llc - Ca | 06/08/2016 |
| 559 | 719 | Landline | New Cingular Wireless Pcs, Llc | 11/20/1998 |
| 559 | 756 | Wireless | New Cingular Wireless Pcs, Llc | 10/31/2001 |
| 559 | 781 | Landline | Pacific Bell | 11/20/1998 |
| 559 | 782 | Landline | Pacific Bell | 11/20/1998 |
| 559 | 783 | Landline | Pacific Bell | 11/20/1998 |
| 559 | 784 | Landline | Pacific Bell | 11/20/1998 |
| 559 | 788 | Landline | Pacific Bell | 11/20/1998 |
| 559 | 789 | Landline | Pacific Bell | 11/20/1998 |
| 559 | 791 | Landline | Pacific Bell | 11/20/1998 |
| 559 | 792 | Landline | Matrix Telecom, Llc. Sii Tnci - Ca | 11/20/1998 |
| 559 | 793 | Landline | Pacific Bell | 11/20/1998 |
| 559 | 853 | Landline | Level 3 Communications, Llc - Ca | 06/03/2005 |
| 559 | 854 | Wireless | Peerless Network Of California, Llc - Ca | 12/31/1969 |
| 559 | 920 | Wireless | Cellco Partnership Dba Verizon Wireless - Ca | 10/13/1999 |
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