| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (510) 420-00** | (510) 420-0000 - (510) 420-0002 | 2 |
| (510) 420-01** | (510) 420-0102 - (510) 420-0197 | 57 |
| (510) 420-02** | (510) 420-0201 - (510) 420-0298 | 63 |
| (510) 420-03** | (510) 420-0301 - (510) 420-0399 | 68 |
| (510) 420-04** | (510) 420-0401 - (510) 420-0498 | 70 |
| (510) 420-05** | (510) 420-0500 - (510) 420-0599 | 72 |
| (510) 420-06** | (510) 420-0600 - (510) 420-0697 | 65 |
| (510) 420-07** | (510) 420-0700 - (510) 420-0797 | 74 |
| (510) 420-08** | (510) 420-0800 - (510) 420-0899 | 64 |
| (510) 420-09** | (510) 420-0900 - (510) 420-0999 | 72 |
US Phone Directory: (510) 420-0***
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