| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 407-10** | (301) 407-1001 - (301) 407-1099 | 22 |
| (301) 407-11** | (301) 407-1139 - (301) 407-1192 | 14 |
| (301) 407-12** | (301) 407-1241 - (301) 407-1297 | 12 |
| (301) 407-13** | (301) 407-1347 - (301) 407-1396 | 9 |
| (301) 407-14** | (301) 407-1439 - (301) 407-1497 | 14 |
| (301) 407-15** | (301) 407-1500 - (301) 407-1597 | 10 |
| (301) 407-16** | (301) 407-1601 - (301) 407-1697 | 21 |
| (301) 407-17** | (301) 407-1701 - (301) 407-1793 | 4 |
| (301) 407-18** | (301) 407-1800 - (301) 407-1888 | 4 |
| (301) 407-19** | (301) 407-1906 - (301) 407-1999 | 22 |
US Phone Directory: (301) 407-1***
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