| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (510) 523-00** | (510) 523-0000 - (510) 523-0098 | 8 |
| (510) 523-01** | (510) 523-0100 - (510) 523-0199 | 53 |
| (510) 523-02** | (510) 523-0201 - (510) 523-0299 | 45 |
| (510) 523-03** | (510) 523-0301 - (510) 523-0399 | 50 |
| (510) 523-04** | (510) 523-0400 - (510) 523-0499 | 52 |
| (510) 523-05** | (510) 523-0500 - (510) 523-0595 | 45 |
| (510) 523-06** | (510) 523-0600 - (510) 523-0697 | 54 |
| (510) 523-07** | (510) 523-0702 - (510) 523-0799 | 44 |
| (510) 523-08** | (510) 523-0800 - (510) 523-0899 | 47 |
| (510) 523-09** | (510) 523-0902 - (510) 523-0998 | 38 |
US Phone Directory: (510) 523-0***
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