| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (415) 721-00** | (415) 721-0000 - (415) 721-0000 | 1 |
| (415) 721-01** | (415) 721-0100 - (415) 721-0199 | 67 |
| (415) 721-02** | (415) 721-0203 - (415) 721-0296 | 41 |
| (415) 721-03** | (415) 721-0300 - (415) 721-0398 | 43 |
| (415) 721-04** | (415) 721-0404 - (415) 721-0498 | 51 |
| (415) 721-05** | (415) 721-0501 - (415) 721-0599 | 50 |
| (415) 721-06** | (415) 721-0600 - (415) 721-0699 | 43 |
| (415) 721-07** | (415) 721-0700 - (415) 721-0798 | 60 |
| (415) 721-08** | (415) 721-0800 - (415) 721-0899 | 42 |
| (415) 721-09** | (415) 721-0900 - (415) 721-0998 | 52 |
US Phone Directory: (415) 721-0***
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