| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (925) 283-40** | (925) 283-4000 - (925) 283-4099 | 48 |
| (925) 283-41** | (925) 283-4100 - (925) 283-4191 | 45 |
| (925) 283-42** | (925) 283-4200 - (925) 283-4299 | 49 |
| (925) 283-43** | (925) 283-4300 - (925) 283-4399 | 53 |
| (925) 283-44** | (925) 283-4401 - (925) 283-4499 | 57 |
| (925) 283-45** | (925) 283-4500 - (925) 283-4599 | 43 |
| (925) 283-46** | (925) 283-4600 - (925) 283-4699 | 52 |
| (925) 283-47** | (925) 283-4700 - (925) 283-4799 | 46 |
| (925) 283-48** | (925) 283-4801 - (925) 283-4899 | 49 |
| (925) 283-49** | (925) 283-4900 - (925) 283-4993 | 41 |
US Phone Directory: (925) 283-4***
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