| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 604-10** | (301) 604-1005 - (301) 604-1032 | 8 |
| (301) 604-11** | (301) 604-1113 - (301) 604-1155 | 3 |
| (301) 604-12** | (301) 604-1200 - (301) 604-1299 | 9 |
| (301) 604-13** | (301) 604-1300 - (301) 604-1399 | 84 |
| (301) 604-14** | (301) 604-1400 - (301) 604-1499 | 82 |
| (301) 604-15** | (301) 604-1500 - (301) 604-1599 | 75 |
| (301) 604-16** | (301) 604-1601 - (301) 604-1699 | 77 |
| (301) 604-17** | (301) 604-1704 - (301) 604-1799 | 71 |
| (301) 604-18** | (301) 604-1800 - (301) 604-1899 | 83 |
| (301) 604-19** | (301) 604-1900 - (301) 604-1999 | 86 |
US Phone Directory: (301) 604-1***
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