| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (510) 812-50** | (510) 812-5006 - (510) 812-5096 | 25 |
| (510) 812-51** | (510) 812-5101 - (510) 812-5199 | 21 |
| (510) 812-52** | (510) 812-5200 - (510) 812-5293 | 18 |
| (510) 812-53** | (510) 812-5303 - (510) 812-5394 | 21 |
| (510) 812-54** | (510) 812-5400 - (510) 812-5497 | 14 |
| (510) 812-55** | (510) 812-5500 - (510) 812-5598 | 19 |
| (510) 812-56** | (510) 812-5609 - (510) 812-5696 | 17 |
| (510) 812-57** | (510) 812-5700 - (510) 812-5785 | 11 |
| (510) 812-58** | (510) 812-5820 - (510) 812-5897 | 8 |
| (510) 812-59** | (510) 812-5901 - (510) 812-5996 | 19 |
US Phone Directory: (510) 812-5***
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