| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 485-10** | (301) 485-1000 - (301) 485-1099 | 87 |
| (301) 485-11** | (301) 485-1100 - (301) 485-1198 | 80 |
| (301) 485-12** | (301) 485-1200 - (301) 485-1299 | 69 |
| (301) 485-13** | (301) 485-1300 - (301) 485-1391 | 56 |
| (301) 485-14** | (301) 485-1401 - (301) 485-1490 | 24 |
| (301) 485-15** | (301) 485-1516 - (301) 485-1576 | 25 |
| (301) 485-16** | (301) 485-1602 - (301) 485-1692 | 41 |
| (301) 485-17** | (301) 485-1709 - (301) 485-1786 | 38 |
| (301) 485-18** | (301) 485-1804 - (301) 485-1818 | 10 |
| (301) 485-19** | (301) 485-1904 - (301) 485-1994 | 21 |
US Phone Directory: (301) 485-1***
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