| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 432-50** | (301) 432-5000 - (301) 432-5099 | 84 |
| (301) 432-51** | (301) 432-5102 - (301) 432-5199 | 80 |
| (301) 432-52** | (301) 432-5201 - (301) 432-5299 | 85 |
| (301) 432-53** | (301) 432-5300 - (301) 432-5398 | 90 |
| (301) 432-54** | (301) 432-5400 - (301) 432-5499 | 83 |
| (301) 432-55** | (301) 432-5500 - (301) 432-5599 | 88 |
| (301) 432-56** | (301) 432-5601 - (301) 432-5699 | 91 |
| (301) 432-57** | (301) 432-5700 - (301) 432-5799 | 92 |
| (301) 432-58** | (301) 432-5800 - (301) 432-5899 | 84 |
| (301) 432-59** | (301) 432-5900 - (301) 432-5999 | 83 |
US Phone Directory: (301) 432-5***
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