| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (510) 531-40** | (510) 531-4000 - (510) 531-4099 | 67 |
| (510) 531-41** | (510) 531-4100 - (510) 531-4199 | 60 |
| (510) 531-42** | (510) 531-4200 - (510) 531-4296 | 58 |
| (510) 531-43** | (510) 531-4300 - (510) 531-4399 | 63 |
| (510) 531-44** | (510) 531-4400 - (510) 531-4497 | 66 |
| (510) 531-45** | (510) 531-4500 - (510) 531-4596 | 67 |
| (510) 531-46** | (510) 531-4600 - (510) 531-4699 | 65 |
| (510) 531-47** | (510) 531-4700 - (510) 531-4799 | 64 |
| (510) 531-48** | (510) 531-4800 - (510) 531-4899 | 80 |
| (510) 531-49** | (510) 531-4900 - (510) 531-4999 | 53 |
US Phone Directory: (510) 531-4***
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