| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 646-10** | (301) 646-1059 - (301) 646-1082 | 6 |
| (301) 646-11** | (301) 646-1138 - (301) 646-1199 | 4 |
| (301) 646-12** | (301) 646-1208 - (301) 646-1282 | 9 |
| (301) 646-13** | (301) 646-1305 - (301) 646-1391 | 9 |
| (301) 646-14** | (301) 646-1412 - (301) 646-1478 | 9 |
| (301) 646-15** | (301) 646-1516 - (301) 646-1578 | 10 |
| (301) 646-16** | (301) 646-1621 - (301) 646-1695 | 7 |
| (301) 646-17** | (301) 646-1713 - (301) 646-1799 | 8 |
| (301) 646-18** | (301) 646-1810 - (301) 646-1866 | 7 |
| (301) 646-19** | (301) 646-1914 - (301) 646-1997 | 8 |
US Phone Directory: (301) 646-1***
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