| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 434-70** | (301) 434-7000 - (301) 434-7097 | 62 |
| (301) 434-71** | (301) 434-7100 - (301) 434-7199 | 72 |
| (301) 434-72** | (301) 434-7204 - (301) 434-7299 | 64 |
| (301) 434-73** | (301) 434-7302 - (301) 434-7398 | 72 |
| (301) 434-74** | (301) 434-7400 - (301) 434-7499 | 70 |
| (301) 434-75** | (301) 434-7500 - (301) 434-7599 | 68 |
| (301) 434-76** | (301) 434-7600 - (301) 434-7699 | 73 |
| (301) 434-77** | (301) 434-7706 - (301) 434-7799 | 62 |
| (301) 434-78** | (301) 434-7801 - (301) 434-7899 | 64 |
| (301) 434-79** | (301) 434-7900 - (301) 434-7999 | 62 |
US Phone Directory: (301) 434-7***
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