| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (510) 420-50** | (510) 420-5000 - (510) 420-5081 | 5 |
| (510) 420-51** | (510) 420-5116 - (510) 420-5162 | 2 |
| (510) 420-52** | (510) 420-5222 - (510) 420-5273 | 3 |
| (510) 420-53** | (510) 420-5320 - (510) 420-5361 | 2 |
| (510) 420-54** | (510) 420-5400 - (510) 420-5450 | 2 |
| (510) 420-55** | (510) 420-5500 - (510) 420-5500 | 1 |
| (510) 420-56** | (510) 420-5616 - (510) 420-5620 | 2 |
| (510) 420-57** | (510) 420-5700 - (510) 420-5795 | 67 |
| (510) 420-58** | (510) 420-5800 - (510) 420-5899 | 72 |
US Phone Directory: (510) 420-5***
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