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The city of Alameda is in the state of California. It has the following active area codes:
| NPA | NXX | Usage | Company Name | NXX Introduced Date |
|---|---|---|---|---|
| 510 | 263 | Landline | Pacific Bell | 02/04/1994 |
| 510 | 263 | Landline | Pacific Bell | 02/04/1994 |
| 510 | 337 | Landline | Pacific Bell | 09/11/1994 |
| 510 | 337 | Landline | Pacific Bell | 09/11/1994 |
| 925 | 409 | Unknown | Cellco Partnership Dba Verizon Wireless - Ca | 08/18/2017 |
| 510 | 521 | Landline | Pacific Bell | 02/04/1994 |
| 510 | 521 | Landline | Pacific Bell | 02/04/1994 |
| 510 | 522 | Landline | Pacific Bell | 02/04/1994 |
| 510 | 522 | Landline | Pacific Bell | 02/04/1994 |
| 510 | 523 | Landline | Pacific Bell | 02/04/1994 |
| 510 | 523 | Landline | Pacific Bell | 02/04/1994 |
| 510 | 571 | Unknown | New Cingular Wireless Pcs, Llc | 08/16/2017 |
| 510 | 747 | Landline | Pacific Bell | 01/10/1996 |
| 510 | 747 | Landline | Pacific Bell | 01/10/1996 |
| 510 | 748 | Landline | Pacific Bell | 02/04/1994 |
| 510 | 748 | Landline | Pacific Bell | 02/04/1994 |
| 510 | 749 | Landline | Pacific Bell | 07/01/1996 |
| 510 | 749 | Landline | Pacific Bell | 07/01/1996 |
| 510 | 769 | Landline | Pacific Bell | 02/04/1994 |
| 510 | 769 | Landline | Pacific Bell | 02/04/1994 |
| 510 | 814 | Landline | Pacific Bell | 02/04/1994 |
| 510 | 814 | Landline | Pacific Bell | 02/04/1994 |
| 510 | 830 | Landline | O1 Communications, Inc. - Ca | 01/25/2001 |
| 510 | 830 | Landline | O1 Communications, Inc. - Ca | 01/25/2001 |
| 510 | 864 | Landline | Pacific Bell | 01/10/1996 |
| 510 | 864 | Landline | Pacific Bell | 01/10/1996 |
| 510 | 865 | Landline | Pacific Bell | 02/04/1994 |
| 510 | 865 | Landline | Pacific Bell | 02/04/1994 |
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