| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 865-10** | (301) 865-1000 - (301) 865-1099 | 86 |
| (301) 865-11** | (301) 865-1100 - (301) 865-1199 | 86 |
| (301) 865-12** | (301) 865-1201 - (301) 865-1299 | 88 |
| (301) 865-13** | (301) 865-1300 - (301) 865-1399 | 87 |
| (301) 865-14** | (301) 865-1400 - (301) 865-1499 | 86 |
| (301) 865-15** | (301) 865-1500 - (301) 865-1599 | 86 |
| (301) 865-16** | (301) 865-1601 - (301) 865-1699 | 86 |
| (301) 865-17** | (301) 865-1701 - (301) 865-1799 | 77 |
| (301) 865-18** | (301) 865-1800 - (301) 865-1899 | 81 |
| (301) 865-19** | (301) 865-1900 - (301) 865-1998 | 88 |
US Phone Directory: (301) 865-1***
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