| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 604-70** | (301) 604-7000 - (301) 604-7099 | 66 |
| (301) 604-71** | (301) 604-7102 - (301) 604-7199 | 62 |
| (301) 604-72** | (301) 604-7201 - (301) 604-7299 | 58 |
| (301) 604-73** | (301) 604-7302 - (301) 604-7398 | 59 |
| (301) 604-74** | (301) 604-7400 - (301) 604-7498 | 63 |
| (301) 604-75** | (301) 604-7501 - (301) 604-7596 | 68 |
| (301) 604-76** | (301) 604-7600 - (301) 604-7699 | 62 |
| (301) 604-77** | (301) 604-7700 - (301) 604-7799 | 80 |
| (301) 604-78** | (301) 604-7801 - (301) 604-7899 | 62 |
| (301) 604-79** | (301) 604-7900 - (301) 604-7999 | 65 |
US Phone Directory: (301) 604-7***
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