| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (510) 228-20** | (510) 228-2009 - (510) 228-2096 | 13 |
| (510) 228-21** | (510) 228-2100 - (510) 228-2196 | 21 |
| (510) 228-22** | (510) 228-2201 - (510) 228-2279 | 20 |
| (510) 228-23** | (510) 228-2305 - (510) 228-2396 | 22 |
| (510) 228-24** | (510) 228-2409 - (510) 228-2491 | 18 |
| (510) 228-25** | (510) 228-2501 - (510) 228-2593 | 14 |
| (510) 228-26** | (510) 228-2600 - (510) 228-2699 | 20 |
| (510) 228-27** | (510) 228-2700 - (510) 228-2798 | 17 |
| (510) 228-28** | (510) 228-2800 - (510) 228-2899 | 18 |
| (510) 228-29** | (510) 228-2900 - (510) 228-2992 | 16 |
US Phone Directory: (510) 228-2***
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