| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 277-10** | (301) 277-1000 - (301) 277-1099 | 77 |
| (301) 277-11** | (301) 277-1100 - (301) 277-1199 | 61 |
| (301) 277-12** | (301) 277-1200 - (301) 277-1298 | 73 |
| (301) 277-13** | (301) 277-1300 - (301) 277-1399 | 76 |
| (301) 277-14** | (301) 277-1400 - (301) 277-1499 | 72 |
| (301) 277-15** | (301) 277-1500 - (301) 277-1599 | 76 |
| (301) 277-16** | (301) 277-1600 - (301) 277-1699 | 76 |
| (301) 277-17** | (301) 277-1700 - (301) 277-1799 | 78 |
| (301) 277-18** | (301) 277-1801 - (301) 277-1899 | 73 |
| (301) 277-19** | (301) 277-1900 - (301) 277-1999 | 83 |
US Phone Directory: (301) 277-1***
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