| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (510) 742-50** | (510) 742-5016 - (510) 742-5016 | 1 |
| (510) 742-51** | (510) 742-5100 - (510) 742-5199 | 56 |
| (510) 742-52** | (510) 742-5200 - (510) 742-5299 | 73 |
| (510) 742-53** | (510) 742-5300 - (510) 742-5399 | 70 |
| (510) 742-54** | (510) 742-5400 - (510) 742-5499 | 62 |
| (510) 742-55** | (510) 742-5500 - (510) 742-5599 | 69 |
| (510) 742-56** | (510) 742-5600 - (510) 742-5699 | 75 |
| (510) 742-57** | (510) 742-5700 - (510) 742-5799 | 67 |
| (510) 742-58** | (510) 742-5800 - (510) 742-5898 | 80 |
| (510) 742-59** | (510) 742-5900 - (510) 742-5998 | 66 |
US Phone Directory: (510) 742-5***
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