| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (415) 503-10** | (415) 503-1000 - (415) 503-1099 | 64 |
| (415) 503-11** | (415) 503-1100 - (415) 503-1195 | 67 |
| (415) 503-12** | (415) 503-1200 - (415) 503-1297 | 59 |
| (415) 503-13** | (415) 503-1301 - (415) 503-1399 | 75 |
| (415) 503-14** | (415) 503-1400 - (415) 503-1498 | 69 |
| (415) 503-15** | (415) 503-1500 - (415) 503-1599 | 77 |
| (415) 503-16** | (415) 503-1600 - (415) 503-1699 | 78 |
| (415) 503-17** | (415) 503-1700 - (415) 503-1798 | 65 |
| (415) 503-18** | (415) 503-1800 - (415) 503-1898 | 72 |
| (415) 503-19** | (415) 503-1900 - (415) 503-1998 | 70 |
US Phone Directory: (415) 503-1***
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