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The city of Claremont is in the state of California. It has the following active area codes:
| NPA | NXX | Usage | Company Name | NXX Introduced Date |
|---|---|---|---|---|
| 909 | 207 | Wireless | Usa Mobility Wireless, Inc. | 09/11/1994 |
| 909 | 267 | Landline | Level 3 Telecom Of California, Lp - Ca | 05/18/1998 |
| 909 | 288 | Landline | Xo California, Inc. | 11/19/2010 |
| 909 | 293 | Landline | Xo California, Inc. | 11/19/2010 |
| 909 | 344 | Wireless | Sprint Spectrum L.p. | 10/02/2012 |
| 909 | 398 | Landline | Frontier California Inc. | 02/04/1994 |
| 909 | 399 | Landline | Frontier California Inc. | 02/04/1994 |
| 909 | 407 | Landline | Mci Worldcom Communications, Inc., Ca | 06/16/2017 |
| 909 | 445 | Landline | Frontier California Inc. | 02/04/1994 |
| 909 | 447 | Landline | Frontier California Inc. | 02/11/1995 |
| 909 | 448 | Landline | Frontier California Inc. | 07/04/1995 |
| 909 | 450 | Landline | Pacific Bell - Clec | 07/01/1996 |
| 909 | 451 | Landline | Mci Worldcom Communications, Inc., Ca | 10/15/1996 |
| 909 | 480 | Landline | Frontier California Inc. | 02/11/1995 |
| 909 | 482 | Landline | Frontier California Inc. | 02/04/1994 |
| 909 | 506 | Wireless | T-mobile Usa, Inc. | 07/25/2016 |
| 909 | 523 | Wireless | Usa Mobility Wireless, Inc. | 04/01/1997 |
| 909 | 541 | Wireless | Sprint Spectrum L.p. | 08/18/2014 |
| 909 | 542 | Landline | Mpower Communications Corp - Ca | 08/14/1998 |
| 909 | 575 | Landline | At&t Local | 01/25/1998 |
| 909 | 603 | Landline | Frontier California Inc. | 02/04/1994 |
| 909 | 607 | Landline | Teleport Communications Group - Los Angeles | 02/04/1994 |
| 909 | 621 | Landline | Frontier California Inc. | 02/04/1994 |
| 909 | 624 | Landline | Frontier California Inc. | 02/04/1994 |
| 909 | 625 | Landline | Frontier California Inc. | 02/04/1994 |
| 909 | 626 | Landline | Frontier California Inc. | 02/04/1994 |
| 909 | 656 | Wireless | Sprint Spectrum L.p. | 12/23/2014 |
| 909 | 667 | Landline | Cf Communications, Llc Dba Telekenex - Ca | 11/23/2010 |
| 909 | 675 | Landline | Broadvox-clec, Llc - Ca | 12/09/2014 |
| 909 | 741 | Wireless | Sprint Spectrum L.p. | 09/09/2015 |
| 909 | 753 | Landline | Xo California, Inc. | 08/20/2000 |
| 909 | 833 | Landline | Bandwidth.com Clec, Llc - Ca | 02/22/2010 |
| 909 | 913 | Wireless | T-mobile Usa, Inc. | 10/17/2002 |
| 909 | 962 | Landline | Teleport Communications Group - Los Angeles | 10/31/2000 |
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