| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (510) 275-30** | (510) 275-3000 - (510) 275-3099 | 90 |
| (510) 275-31** | (510) 275-3100 - (510) 275-3199 | 82 |
| (510) 275-32** | (510) 275-3200 - (510) 275-3299 | 82 |
| (510) 275-33** | (510) 275-3300 - (510) 275-3396 | 83 |
| (510) 275-34** | (510) 275-3400 - (510) 275-3497 | 83 |
| (510) 275-35** | (510) 275-3500 - (510) 275-3599 | 89 |
| (510) 275-36** | (510) 275-3600 - (510) 275-3699 | 84 |
| (510) 275-37** | (510) 275-3700 - (510) 275-3799 | 74 |
| (510) 275-38** | (510) 275-3800 - (510) 275-3899 | 96 |
| (510) 275-39** | (510) 275-3900 - (510) 275-3997 | 74 |
US Phone Directory: (510) 275-3***
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