| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (510) 523-20** | (510) 523-2000 - (510) 523-2099 | 60 |
| (510) 523-21** | (510) 523-2100 - (510) 523-2198 | 54 |
| (510) 523-22** | (510) 523-2200 - (510) 523-2299 | 62 |
| (510) 523-23** | (510) 523-2302 - (510) 523-2399 | 65 |
| (510) 523-24** | (510) 523-2400 - (510) 523-2498 | 50 |
| (510) 523-25** | (510) 523-2500 - (510) 523-2598 | 59 |
| (510) 523-26** | (510) 523-2600 - (510) 523-2698 | 63 |
| (510) 523-27** | (510) 523-2701 - (510) 523-2795 | 56 |
| (510) 523-28** | (510) 523-2800 - (510) 523-2895 | 51 |
| (510) 523-29** | (510) 523-2900 - (510) 523-2998 | 57 |
US Phone Directory: (510) 523-2***
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