| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (510) 531-90** | (510) 531-9000 - (510) 531-9099 | 60 |
| (510) 531-91** | (510) 531-9100 - (510) 531-9197 | 59 |
| (510) 531-92** | (510) 531-9200 - (510) 531-9299 | 68 |
| (510) 531-93** | (510) 531-9300 - (510) 531-9398 | 58 |
| (510) 531-94** | (510) 531-9400 - (510) 531-9499 | 50 |
| (510) 531-95** | (510) 531-9501 - (510) 531-9599 | 51 |
| (510) 531-96** | (510) 531-9600 - (510) 531-9699 | 56 |
| (510) 531-97** | (510) 531-9700 - (510) 531-9799 | 45 |
| (510) 531-98** | (510) 531-9805 - (510) 531-9888 | 13 |
| (510) 531-99** | (510) 531-9900 - (510) 531-9999 | 20 |
US Phone Directory: (510) 531-9***
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