| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (415) 203-50** | (415) 203-5000 - (415) 203-5097 | 23 |
| (415) 203-51** | (415) 203-5107 - (415) 203-5198 | 19 |
| (415) 203-52** | (415) 203-5204 - (415) 203-5299 | 18 |
| (415) 203-53** | (415) 203-5303 - (415) 203-5398 | 14 |
| (415) 203-54** | (415) 203-5400 - (415) 203-5480 | 19 |
| (415) 203-55** | (415) 203-5501 - (415) 203-5598 | 29 |
| (415) 203-56** | (415) 203-5601 - (415) 203-5698 | 18 |
| (415) 203-57** | (415) 203-5702 - (415) 203-5794 | 19 |
| (415) 203-58** | (415) 203-5802 - (415) 203-5898 | 25 |
| (415) 203-59** | (415) 203-5906 - (415) 203-5991 | 15 |
US Phone Directory: (415) 203-5***
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