| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 728-70** | (301) 728-7000 - (301) 728-7099 | 17 |
| (301) 728-71** | (301) 728-7101 - (301) 728-7196 | 10 |
| (301) 728-72** | (301) 728-7205 - (301) 728-7288 | 13 |
| (301) 728-73** | (301) 728-7301 - (301) 728-7399 | 10 |
| (301) 728-74** | (301) 728-7426 - (301) 728-7499 | 10 |
| (301) 728-75** | (301) 728-7505 - (301) 728-7597 | 14 |
| (301) 728-76** | (301) 728-7614 - (301) 728-7696 | 9 |
| (301) 728-77** | (301) 728-7714 - (301) 728-7785 | 10 |
| (301) 728-78** | (301) 728-7807 - (301) 728-7895 | 12 |
| (301) 728-79** | (301) 728-7922 - (301) 728-7998 | 13 |
US Phone Directory: (301) 728-7***
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