| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (510) 520-00** | (510) 520-0006 - (510) 520-0089 | 21 |
| (510) 520-01** | (510) 520-0104 - (510) 520-0184 | 19 |
| (510) 520-02** | (510) 520-0203 - (510) 520-0296 | 30 |
| (510) 520-03** | (510) 520-0325 - (510) 520-0391 | 11 |
| (510) 520-04** | (510) 520-0400 - (510) 520-0499 | 19 |
| (510) 520-05** | (510) 520-0506 - (510) 520-0596 | 20 |
| (510) 520-06** | (510) 520-0602 - (510) 520-0699 | 20 |
| (510) 520-07** | (510) 520-0703 - (510) 520-0796 | 24 |
| (510) 520-08** | (510) 520-0800 - (510) 520-0888 | 18 |
| (510) 520-09** | (510) 520-0905 - (510) 520-0996 | 19 |
US Phone Directory: (510) 520-0***
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