| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (510) 283-50** | (510) 283-5002 - (510) 283-5099 | 44 |
| (510) 283-51** | (510) 283-5107 - (510) 283-5191 | 10 |
| (510) 283-52** | (510) 283-5227 - (510) 283-5297 | 4 |
| (510) 283-53** | (510) 283-5302 - (510) 283-5393 | 21 |
| (510) 283-54** | (510) 283-5400 - (510) 283-5496 | 10 |
| (510) 283-55** | (510) 283-5536 - (510) 283-5558 | 2 |
| (510) 283-56** | (510) 283-5666 - (510) 283-5688 | 3 |
| (510) 283-57** | (510) 283-5718 - (510) 283-5799 | 5 |
| (510) 283-58** | (510) 283-5803 - (510) 283-5812 | 2 |
| (510) 283-59** | (510) 283-5902 - (510) 283-5977 | 11 |
US Phone Directory: (510) 283-5***
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