| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 834-70** | (301) 834-7000 - (301) 834-7099 | 90 |
| (301) 834-71** | (301) 834-7100 - (301) 834-7199 | 77 |
| (301) 834-72** | (301) 834-7200 - (301) 834-7298 | 88 |
| (301) 834-73** | (301) 834-7300 - (301) 834-7399 | 79 |
| (301) 834-74** | (301) 834-7400 - (301) 834-7499 | 87 |
| (301) 834-75** | (301) 834-7500 - (301) 834-7599 | 90 |
| (301) 834-76** | (301) 834-7601 - (301) 834-7699 | 83 |
| (301) 834-77** | (301) 834-7700 - (301) 834-7799 | 84 |
| (301) 834-78** | (301) 834-7800 - (301) 834-7899 | 85 |
| (301) 834-79** | (301) 834-7900 - (301) 834-7998 | 85 |
US Phone Directory: (301) 834-7***
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