| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (240) 839-70** | (240) 839-7000 - (240) 839-7099 | 82 |
| (240) 839-71** | (240) 839-7100 - (240) 839-7199 | 88 |
| (240) 839-72** | (240) 839-7200 - (240) 839-7299 | 85 |
| (240) 839-73** | (240) 839-7300 - (240) 839-7399 | 86 |
| (240) 839-74** | (240) 839-7400 - (240) 839-7498 | 82 |
| (240) 839-75** | (240) 839-7500 - (240) 839-7599 | 85 |
| (240) 839-76** | (240) 839-7600 - (240) 839-7699 | 80 |
| (240) 839-77** | (240) 839-7701 - (240) 839-7799 | 77 |
| (240) 839-78** | (240) 839-7800 - (240) 839-7899 | 78 |
| (240) 839-79** | (240) 839-7900 - (240) 839-7999 | 75 |
US Phone Directory: (240) 839-7***
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