| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 779-10** | (301) 779-1001 - (301) 779-1099 | 72 |
| (301) 779-11** | (301) 779-1104 - (301) 779-1199 | 68 |
| (301) 779-12** | (301) 779-1200 - (301) 779-1297 | 73 |
| (301) 779-13** | (301) 779-1300 - (301) 779-1399 | 82 |
| (301) 779-14** | (301) 779-1400 - (301) 779-1498 | 65 |
| (301) 779-15** | (301) 779-1501 - (301) 779-1599 | 72 |
| (301) 779-16** | (301) 779-1601 - (301) 779-1699 | 78 |
| (301) 779-17** | (301) 779-1700 - (301) 779-1799 | 87 |
| (301) 779-18** | (301) 779-1800 - (301) 779-1899 | 78 |
| (301) 779-19** | (301) 779-1900 - (301) 779-1999 | 74 |
US Phone Directory: (301) 779-1***
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