| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (510) 531-80** | (510) 531-8000 - (510) 531-8098 | 65 |
| (510) 531-81** | (510) 531-8100 - (510) 531-8199 | 68 |
| (510) 531-82** | (510) 531-8201 - (510) 531-8299 | 70 |
| (510) 531-83** | (510) 531-8300 - (510) 531-8399 | 65 |
| (510) 531-84** | (510) 531-8400 - (510) 531-8498 | 60 |
| (510) 531-85** | (510) 531-8500 - (510) 531-8599 | 55 |
| (510) 531-86** | (510) 531-8600 - (510) 531-8699 | 70 |
| (510) 531-87** | (510) 531-8700 - (510) 531-8798 | 65 |
| (510) 531-88** | (510) 531-8800 - (510) 531-8899 | 62 |
| (510) 531-89** | (510) 531-8900 - (510) 531-8999 | 67 |
US Phone Directory: (510) 531-8***
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