| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (510) 531-00** | (510) 531-0000 - (510) 531-0000 | 1 |
| (510) 531-01** | (510) 531-0100 - (510) 531-0197 | 46 |
| (510) 531-02** | (510) 531-0200 - (510) 531-0299 | 64 |
| (510) 531-03** | (510) 531-0303 - (510) 531-0399 | 57 |
| (510) 531-04** | (510) 531-0400 - (510) 531-0499 | 55 |
| (510) 531-05** | (510) 531-0500 - (510) 531-0598 | 54 |
| (510) 531-06** | (510) 531-0600 - (510) 531-0699 | 57 |
| (510) 531-07** | (510) 531-0700 - (510) 531-0798 | 55 |
| (510) 531-08** | (510) 531-0800 - (510) 531-0899 | 54 |
| (510) 531-09** | (510) 531-0900 - (510) 531-0998 | 59 |
US Phone Directory: (510) 531-0***
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