| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 350-50** | (301) 350-5000 - (301) 350-5098 | 73 |
| (301) 350-51** | (301) 350-5100 - (301) 350-5199 | 78 |
| (301) 350-52** | (301) 350-5200 - (301) 350-5299 | 76 |
| (301) 350-53** | (301) 350-5300 - (301) 350-5399 | 72 |
| (301) 350-54** | (301) 350-5401 - (301) 350-5499 | 71 |
| (301) 350-55** | (301) 350-5500 - (301) 350-5599 | 58 |
| (301) 350-56** | (301) 350-5600 - (301) 350-5699 | 72 |
| (301) 350-57** | (301) 350-5701 - (301) 350-5799 | 68 |
| (301) 350-58** | (301) 350-5800 - (301) 350-5899 | 68 |
| (301) 350-59** | (301) 350-5900 - (301) 350-5999 | 63 |
US Phone Directory: (301) 350-5***
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