| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (510) 232-50** | (510) 232-5000 - (510) 232-5099 | 69 |
| (510) 232-51** | (510) 232-5100 - (510) 232-5197 | 74 |
| (510) 232-52** | (510) 232-5200 - (510) 232-5299 | 72 |
| (510) 232-53** | (510) 232-5300 - (510) 232-5399 | 68 |
| (510) 232-54** | (510) 232-5400 - (510) 232-5495 | 68 |
| (510) 232-55** | (510) 232-5500 - (510) 232-5599 | 64 |
| (510) 232-56** | (510) 232-5600 - (510) 232-5696 | 64 |
| (510) 232-57** | (510) 232-5700 - (510) 232-5798 | 66 |
| (510) 232-58** | (510) 232-5800 - (510) 232-5897 | 64 |
| (510) 232-59** | (510) 232-5902 - (510) 232-5999 | 63 |
US Phone Directory: (510) 232-5***
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