| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (510) 521-20** | (510) 521-2000 - (510) 521-2099 | 65 |
| (510) 521-21** | (510) 521-2100 - (510) 521-2199 | 74 |
| (510) 521-22** | (510) 521-2200 - (510) 521-2299 | 63 |
| (510) 521-23** | (510) 521-2300 - (510) 521-2399 | 72 |
| (510) 521-24** | (510) 521-2400 - (510) 521-2499 | 71 |
| (510) 521-25** | (510) 521-2500 - (510) 521-2598 | 62 |
| (510) 521-26** | (510) 521-2601 - (510) 521-2698 | 68 |
| (510) 521-27** | (510) 521-2700 - (510) 521-2798 | 61 |
| (510) 521-28** | (510) 521-2800 - (510) 521-2899 | 72 |
| (510) 521-29** | (510) 521-2900 - (510) 521-2999 | 74 |
US Phone Directory: (510) 521-2***
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