| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 559-70** | (301) 559-7000 - (301) 559-7099 | 79 |
| (301) 559-71** | (301) 559-7100 - (301) 559-7198 | 73 |
| (301) 559-72** | (301) 559-7201 - (301) 559-7299 | 77 |
| (301) 559-73** | (301) 559-7300 - (301) 559-7398 | 71 |
| (301) 559-74** | (301) 559-7400 - (301) 559-7499 | 80 |
| (301) 559-75** | (301) 559-7500 - (301) 559-7599 | 75 |
| (301) 559-76** | (301) 559-7601 - (301) 559-7699 | 75 |
| (301) 559-77** | (301) 559-7700 - (301) 559-7798 | 75 |
| (301) 559-78** | (301) 559-7800 - (301) 559-7899 | 70 |
| (301) 559-79** | (301) 559-7900 - (301) 559-7999 | 71 |
US Phone Directory: (301) 559-7***
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