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The city of Granada Hills is in the state of California. It has the following active area codes:
| NPA | NXX | Usage | Company Name | NXX Introduced Date |
|---|---|---|---|---|
| 747 | 210 | Wireless | Teleport Communications Group - Los Angeles | 12/31/1969 |
| 747 | 232 | Wireless | Cellco Partnership Dba Verizon Wireless - Ca | 04/14/2014 |
| 818 | 233 | Wireless | Sprint Spectrum L.p. | 06/22/2007 |
| 747 | 239 | Wireless | Cellco Partnership Dba Verizon Wireless - Ca | 04/14/2015 |
| 747 | 246 | Wireless | Sprint Spectrum L.p. | 04/13/2015 |
| 747 | 252 | Wireless | T-mobile Usa, Inc. | 04/16/2015 |
| 747 | 253 | Landline | Bandwidth.com Clec, Llc - Ca | 04/24/2015 |
| 818 | 256 | Landline | Pacific Bell - Clec | 05/10/1999 |
| 747 | 260 | Wireless | T-mobile Usa, Inc. | 11/14/2016 |
| 818 | 270 | Landline | Frontier California Inc. | 07/04/1995 |
| 818 | 271 | Landline | Frontier California Inc. | 07/04/1995 |
| 818 | 282 | Landline | Teleport Communications Group - Los Angeles | 07/22/1999 |
| 747 | 300 | Landline | Cf Communications, Llc Dba Telekenex - Ca | 10/11/2012 |
| 747 | 322 | Landline | Peerless Network Of California, Llc - Ca | 03/08/2013 |
| 818 | 322 | Landline | Level 3 Communications, Llc - Ca | 01/25/1998 |
| 818 | 332 | Landline | Broadwing Communications, Llc - Ca | 05/10/1999 |
| 818 | 336 | Landline | Level 3 Telecom Of California, Lp - Ca | 10/13/1999 |
| 818 | 356 | Landline | Xo California, Inc. | 07/22/1999 |
| 818 | 359 | Wireless | New Cingular Wireless Pcs, Llc | 10/13/1999 |
| 818 | 360 | Landline | Frontier California Inc. | 02/04/1994 |
| 818 | 361 | Landline | Frontier California Inc. | 02/04/1994 |
| 818 | 362 | Landline | Frontier California Inc. | 02/04/1994 |
| 818 | 363 | Landline | Frontier California Inc. | 02/04/1994 |
| 818 | 364 | Landline | Frontier California Inc. | 02/04/1994 |
| 818 | 365 | Landline | Frontier California Inc. | 02/04/1994 |
| 818 | 366 | Landline | Frontier California Inc. | 02/04/1994 |
| 818 | 367 | Landline | Frontier California Inc. | 02/04/1994 |
| 818 | 368 | Landline | Frontier California Inc. | 02/04/1994 |
| 818 | 403 | Wireless | Cellco Partnership Dba Verizon Wireless - Ca | 03/19/2008 |
| 818 | 408 | Landline | Mpower Communications Corp - Ca | 06/13/2000 |
| 818 | 472 | Wireless | New Cingular Wireless Pcs, Llc | 04/19/2001 |
| 818 | 488 | Landline | Pacific Bell - Clec | 06/13/2000 |
| 818 | 491 | Landline | Mci Worldcom Communications, Inc., Ca | 10/15/1996 |
| 818 | 493 | Landline | Mci Worldcom Communications, Inc., Ca | 10/15/1996 |
| 818 | 496 | Landline | Frontier California Inc. | 02/12/2007 |
| 747 | 500 | Landline | Cf Communications, Llc Dba Telekenex - Ca | 10/11/2012 |
| 818 | 581 | Wireless | Sprint Spectrum L.p. | 01/28/2002 |
| 747 | 600 | Landline | Cf Communications, Llc Dba Telekenex - Ca | 01/06/2012 |
| 818 | 639 | Landline | Cf Communications, Llc Dba Telekenex - Ca | 11/12/2010 |
| 818 | 675 | Landline | Teleport Communications Group - Los Angeles | 10/31/2000 |
| 818 | 698 | Landline | Matrix Telecom, Llc. Sii Tnci - Ca | 10/15/1996 |
| 818 | 741 | Landline | Mci Worldcom Communications, Inc., Ca | 04/01/1997 |
| 818 | 743 | Landline | Matrix Telecom, Llc. Sii Tnci - Ca | 11/20/1998 |
| 818 | 744 | Wireless | T-mobile Usa, Inc. | 09/20/2002 |
| 818 | 792 | Wireless | Sprint Spectrum L.p. | 05/12/2006 |
| 818 | 800 | Wireless | New Cingular Wireless Pcs, Llc | 06/26/2001 |
| 818 | 831 | Landline | Frontier California Inc. | 02/04/1994 |
| 818 | 832 | Landline | Frontier California Inc. | 02/04/1994 |
| 818 | 833 | Landline | Frontier California Inc. | 02/04/1994 |
| 818 | 837 | Landline | Frontier California Inc. | 02/04/1994 |
| 818 | 838 | Landline | Frontier California Inc. | 07/01/1996 |
| 818 | 898 | Landline | Frontier California Inc. | 02/04/1994 |
| 818 | 900 | Landline | Level 3 Communications, Llc - Ca | 04/22/2010 |
| 818 | 910 | Wireless | Shelcomm | 02/22/2001 |
| 818 | 923 | Landline | Level 3 Communications, Llc - Ca | 10/16/2006 |
| 818 | 966 | Wireless | New Cingular Wireless Pcs, Llc | 10/06/2014 |
| 818 | 979 | Landline | Allegiance Telecom, Inc. - Ca | 06/13/2000 |
| 747 | 999 | Landline | Telcentris Communications, Llc - Ca | 07/20/2010 |
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