| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 434-10** | (301) 434-1000 - (301) 434-1098 | 86 |
| (301) 434-11** | (301) 434-1100 - (301) 434-1199 | 87 |
| (301) 434-12** | (301) 434-1200 - (301) 434-1298 | 76 |
| (301) 434-13** | (301) 434-1300 - (301) 434-1398 | 78 |
| (301) 434-14** | (301) 434-1400 - (301) 434-1499 | 79 |
| (301) 434-15** | (301) 434-1500 - (301) 434-1597 | 90 |
| (301) 434-16** | (301) 434-1600 - (301) 434-1698 | 90 |
| (301) 434-17** | (301) 434-1702 - (301) 434-1799 | 81 |
| (301) 434-18** | (301) 434-1800 - (301) 434-1899 | 87 |
| (301) 434-19** | (301) 434-1901 - (301) 434-1999 | 85 |
US Phone Directory: (301) 434-1***
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