| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (510) 821-20** | (510) 821-2001 - (510) 821-2096 | 15 |
| (510) 821-21** | (510) 821-2105 - (510) 821-2194 | 14 |
| (510) 821-22** | (510) 821-2205 - (510) 821-2295 | 19 |
| (510) 821-23** | (510) 821-2311 - (510) 821-2396 | 11 |
| (510) 821-24** | (510) 821-2402 - (510) 821-2499 | 15 |
| (510) 821-25** | (510) 821-2504 - (510) 821-2599 | 8 |
| (510) 821-26** | (510) 821-2601 - (510) 821-2693 | 17 |
| (510) 821-27** | (510) 821-2707 - (510) 821-2798 | 18 |
| (510) 821-28** | (510) 821-2800 - (510) 821-2890 | 13 |
| (510) 821-29** | (510) 821-2900 - (510) 821-2997 | 13 |
US Phone Directory: (510) 821-2***
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