| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 879-50** | (301) 879-5004 - (301) 879-5099 | 51 |
| (301) 879-51** | (301) 879-5101 - (301) 879-5199 | 54 |
| (301) 879-52** | (301) 879-5200 - (301) 879-5299 | 53 |
| (301) 879-53** | (301) 879-5335 - (301) 879-5335 | 1 |
| (301) 879-54** | (301) 879-5404 - (301) 879-5446 | 10 |
| (301) 879-55** | (301) 879-5530 - (301) 879-5559 | 9 |
| (301) 879-56** | (301) 879-5600 - (301) 879-5699 | 34 |
| (301) 879-57** | (301) 879-5701 - (301) 879-5797 | 43 |
| (301) 879-58** | (301) 879-5802 - (301) 879-5899 | 42 |
| (301) 879-59** | (301) 879-5900 - (301) 879-5999 | 33 |
US Phone Directory: (301) 879-5***
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