| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 365-10** | (301) 365-1000 - (301) 365-1099 | 70 |
| (301) 365-11** | (301) 365-1100 - (301) 365-1197 | 75 |
| (301) 365-12** | (301) 365-1200 - (301) 365-1299 | 82 |
| (301) 365-13** | (301) 365-1301 - (301) 365-1398 | 77 |
| (301) 365-14** | (301) 365-1400 - (301) 365-1499 | 70 |
| (301) 365-15** | (301) 365-1500 - (301) 365-1599 | 79 |
| (301) 365-16** | (301) 365-1600 - (301) 365-1699 | 71 |
| (301) 365-17** | (301) 365-1700 - (301) 365-1797 | 71 |
| (301) 365-18** | (301) 365-1800 - (301) 365-1899 | 78 |
| (301) 365-19** | (301) 365-1900 - (301) 365-1998 | 78 |
US Phone Directory: (301) 365-1***
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