| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 977-10** | (301) 977-1000 - (301) 977-1099 | 82 |
| (301) 977-11** | (301) 977-1100 - (301) 977-1199 | 82 |
| (301) 977-12** | (301) 977-1200 - (301) 977-1299 | 81 |
| (301) 977-13** | (301) 977-1300 - (301) 977-1399 | 77 |
| (301) 977-14** | (301) 977-1400 - (301) 977-1499 | 83 |
| (301) 977-15** | (301) 977-1500 - (301) 977-1598 | 86 |
| (301) 977-16** | (301) 977-1600 - (301) 977-1699 | 81 |
| (301) 977-17** | (301) 977-1700 - (301) 977-1798 | 88 |
| (301) 977-18** | (301) 977-1800 - (301) 977-1899 | 82 |
| (301) 977-19** | (301) 977-1900 - (301) 977-1997 | 80 |
US Phone Directory: (301) 977-1***
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