| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 431-50** | (301) 431-5099 - (301) 431-5099 | 1 |
| (301) 431-51** | (301) 431-5195 - (301) 431-5195 | 1 |
| (301) 431-53** | (301) 431-5321 - (301) 431-5334 | 2 |
| (301) 431-54** | (301) 431-5415 - (301) 431-5455 | 6 |
| (301) 431-55** | (301) 431-5500 - (301) 431-5533 | 3 |
| (301) 431-56** | (301) 431-5601 - (301) 431-5682 | 6 |
| (301) 431-57** | (301) 431-5700 - (301) 431-5794 | 48 |
US Phone Directory: (301) 431-5***
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