| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (240) 280-70** | (240) 280-7000 - (240) 280-7099 | 87 |
| (240) 280-71** | (240) 280-7100 - (240) 280-7198 | 79 |
| (240) 280-72** | (240) 280-7200 - (240) 280-7299 | 79 |
| (240) 280-73** | (240) 280-7300 - (240) 280-7398 | 81 |
| (240) 280-74** | (240) 280-7400 - (240) 280-7499 | 88 |
| (240) 280-75** | (240) 280-7501 - (240) 280-7599 | 84 |
| (240) 280-76** | (240) 280-7600 - (240) 280-7699 | 85 |
| (240) 280-77** | (240) 280-7700 - (240) 280-7799 | 85 |
| (240) 280-78** | (240) 280-7802 - (240) 280-7899 | 66 |
| (240) 280-79** | (240) 280-7900 - (240) 280-7999 | 82 |
US Phone Directory: (240) 280-7***
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