| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (240) 421-50** | (240) 421-5052 - (240) 421-5091 | 3 |
| (240) 421-51** | (240) 421-5110 - (240) 421-5147 | 3 |
| (240) 421-52** | (240) 421-5213 - (240) 421-5224 | 3 |
| (240) 421-53** | (240) 421-5305 - (240) 421-5389 | 7 |
| (240) 421-54** | (240) 421-5412 - (240) 421-5497 | 2 |
| (240) 421-55** | (240) 421-5511 - (240) 421-5593 | 5 |
| (240) 421-56** | (240) 421-5614 - (240) 421-5632 | 2 |
| (240) 421-57** | (240) 421-5701 - (240) 421-5753 | 3 |
| (240) 421-58** | (240) 421-5818 - (240) 421-5897 | 4 |
| (240) 421-59** | (240) 421-5908 - (240) 421-5967 | 5 |
US Phone Directory: (240) 421-5***
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