| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 336-10** | (301) 336-1000 - (301) 336-1098 | 71 |
| (301) 336-11** | (301) 336-1100 - (301) 336-1199 | 76 |
| (301) 336-12** | (301) 336-1200 - (301) 336-1299 | 64 |
| (301) 336-13** | (301) 336-1300 - (301) 336-1399 | 71 |
| (301) 336-14** | (301) 336-1400 - (301) 336-1499 | 80 |
| (301) 336-15** | (301) 336-1502 - (301) 336-1599 | 72 |
| (301) 336-16** | (301) 336-1601 - (301) 336-1699 | 80 |
| (301) 336-17** | (301) 336-1700 - (301) 336-1799 | 81 |
| (301) 336-18** | (301) 336-1801 - (301) 336-1899 | 74 |
| (301) 336-19** | (301) 336-1901 - (301) 336-1999 | 83 |
US Phone Directory: (301) 336-1***
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