| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (510) 257-10** | (510) 257-1000 - (510) 257-1000 | 1 |
| (510) 257-11** | (510) 257-1100 - (510) 257-1176 | 5 |
| (510) 257-12** | (510) 257-1241 - (510) 257-1280 | 17 |
| (510) 257-14** | (510) 257-1400 - (510) 257-1453 | 3 |
| (510) 257-15** | (510) 257-1500 - (510) 257-1580 | 3 |
| (510) 257-16** | (510) 257-1607 - (510) 257-1607 | 1 |
| (510) 257-18** | (510) 257-1858 - (510) 257-1858 | 1 |
| (510) 257-19** | (510) 257-1900 - (510) 257-1910 | 2 |
US Phone Directory: (510) 257-1***
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