| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 523-70** | (301) 523-7005 - (301) 523-7096 | 29 |
| (301) 523-71** | (301) 523-7102 - (301) 523-7198 | 30 |
| (301) 523-72** | (301) 523-7204 - (301) 523-7297 | 29 |
| (301) 523-73** | (301) 523-7304 - (301) 523-7392 | 25 |
| (301) 523-74** | (301) 523-7400 - (301) 523-7494 | 36 |
| (301) 523-75** | (301) 523-7504 - (301) 523-7593 | 31 |
| (301) 523-76** | (301) 523-7606 - (301) 523-7696 | 27 |
| (301) 523-77** | (301) 523-7700 - (301) 523-7793 | 30 |
| (301) 523-78** | (301) 523-7802 - (301) 523-7896 | 24 |
| (301) 523-79** | (301) 523-7905 - (301) 523-7999 | 32 |
US Phone Directory: (301) 523-7***
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