| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (240) 912-50** | (240) 912-5000 - (240) 912-5099 | 97 |
| (240) 912-51** | (240) 912-5100 - (240) 912-5199 | 93 |
| (240) 912-52** | (240) 912-5200 - (240) 912-5299 | 95 |
| (240) 912-53** | (240) 912-5300 - (240) 912-5399 | 96 |
| (240) 912-54** | (240) 912-5400 - (240) 912-5499 | 94 |
| (240) 912-55** | (240) 912-5500 - (240) 912-5599 | 94 |
| (240) 912-56** | (240) 912-5600 - (240) 912-5699 | 93 |
| (240) 912-57** | (240) 912-5701 - (240) 912-5799 | 93 |
| (240) 912-58** | (240) 912-5801 - (240) 912-5899 | 94 |
| (240) 912-59** | (240) 912-5900 - (240) 912-5998 | 89 |
US Phone Directory: (240) 912-5***
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