| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (240) 899-50** | (240) 899-5022 - (240) 899-5081 | 5 |
| (240) 899-51** | (240) 899-5160 - (240) 899-5183 | 3 |
| (240) 899-52** | (240) 899-5203 - (240) 899-5263 | 2 |
| (240) 899-53** | (240) 899-5315 - (240) 899-5322 | 3 |
| (240) 899-54** | (240) 899-5415 - (240) 899-5485 | 6 |
| (240) 899-55** | (240) 899-5504 - (240) 899-5578 | 7 |
| (240) 899-56** | (240) 899-5643 - (240) 899-5672 | 3 |
| (240) 899-57** | (240) 899-5711 - (240) 899-5779 | 5 |
| (240) 899-58** | (240) 899-5808 - (240) 899-5877 | 3 |
| (240) 899-59** | (240) 899-5904 - (240) 899-5974 | 8 |
US Phone Directory: (240) 899-5***
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