| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 204-10** | (301) 204-1040 - (301) 204-1040 | 1 |
| (301) 204-11** | (301) 204-1107 - (301) 204-1197 | 4 |
| (301) 204-12** | (301) 204-1215 - (301) 204-1295 | 5 |
| (301) 204-13** | (301) 204-1307 - (301) 204-1381 | 7 |
| (301) 204-14** | (301) 204-1403 - (301) 204-1445 | 3 |
| (301) 204-15** | (301) 204-1501 - (301) 204-1594 | 3 |
| (301) 204-16** | (301) 204-1631 - (301) 204-1683 | 5 |
| (301) 204-17** | (301) 204-1722 - (301) 204-1776 | 5 |
| (301) 204-18** | (301) 204-1817 - (301) 204-1837 | 4 |
| (301) 204-19** | (301) 204-1933 - (301) 204-1987 | 3 |
US Phone Directory: (301) 204-1***
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