| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (510) 231-00** | (510) 231-0000 - (510) 231-0070 | 2 |
| (510) 231-01** | (510) 231-0101 - (510) 231-0199 | 69 |
| (510) 231-02** | (510) 231-0200 - (510) 231-0299 | 65 |
| (510) 231-03** | (510) 231-0301 - (510) 231-0399 | 67 |
| (510) 231-04** | (510) 231-0400 - (510) 231-0499 | 76 |
| (510) 231-05** | (510) 231-0500 - (510) 231-0599 | 77 |
| (510) 231-06** | (510) 231-0601 - (510) 231-0699 | 68 |
| (510) 231-07** | (510) 231-0700 - (510) 231-0799 | 62 |
| (510) 231-08** | (510) 231-0800 - (510) 231-0898 | 83 |
| (510) 231-09** | (510) 231-0900 - (510) 231-0999 | 76 |
US Phone Directory: (510) 231-0***
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