| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (510) 420-10** | (510) 420-1001 - (510) 420-1099 | 65 |
| (510) 420-11** | (510) 420-1100 - (510) 420-1199 | 72 |
| (510) 420-12** | (510) 420-1200 - (510) 420-1298 | 81 |
| (510) 420-13** | (510) 420-1301 - (510) 420-1399 | 66 |
| (510) 420-14** | (510) 420-1400 - (510) 420-1498 | 77 |
| (510) 420-15** | (510) 420-1500 - (510) 420-1599 | 69 |
| (510) 420-16** | (510) 420-1600 - (510) 420-1699 | 73 |
| (510) 420-17** | (510) 420-1700 - (510) 420-1799 | 56 |
| (510) 420-18** | (510) 420-1800 - (510) 420-1899 | 80 |
| (510) 420-19** | (510) 420-1901 - (510) 420-1997 | 78 |
US Phone Directory: (510) 420-1***
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