| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 292-70** | (301) 292-7000 - (301) 292-7099 | 78 |
| (301) 292-71** | (301) 292-7100 - (301) 292-7198 | 76 |
| (301) 292-72** | (301) 292-7200 - (301) 292-7299 | 67 |
| (301) 292-73** | (301) 292-7301 - (301) 292-7399 | 77 |
| (301) 292-74** | (301) 292-7400 - (301) 292-7498 | 75 |
| (301) 292-75** | (301) 292-7500 - (301) 292-7599 | 75 |
| (301) 292-76** | (301) 292-7600 - (301) 292-7699 | 72 |
| (301) 292-77** | (301) 292-7700 - (301) 292-7799 | 70 |
| (301) 292-78** | (301) 292-7800 - (301) 292-7899 | 67 |
| (301) 292-79** | (301) 292-7900 - (301) 292-7999 | 66 |
US Phone Directory: (301) 292-7***
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