| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 449-10** | (301) 449-1000 - (301) 449-1091 | 59 |
| (301) 449-11** | (301) 449-1100 - (301) 449-1189 | 52 |
| (301) 449-12** | (301) 449-1200 - (301) 449-1297 | 47 |
| (301) 449-13** | (301) 449-1300 - (301) 449-1333 | 6 |
| (301) 449-14** | (301) 449-1400 - (301) 449-1485 | 44 |
| (301) 449-15** | (301) 449-1500 - (301) 449-1593 | 44 |
| (301) 449-16** | (301) 449-1600 - (301) 449-1699 | 47 |
| (301) 449-17** | (301) 449-1705 - (301) 449-1788 | 8 |
| (301) 449-18** | (301) 449-1800 - (301) 449-1893 | 44 |
| (301) 449-19** | (301) 449-1900 - (301) 449-1999 | 56 |
US Phone Directory: (301) 449-1***
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