| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 203-50** | (301) 203-5000 - (301) 203-5098 | 44 |
| (301) 203-51** | (301) 203-5101 - (301) 203-5196 | 57 |
| (301) 203-53** | (301) 203-5300 - (301) 203-5399 | 53 |
| (301) 203-54** | (301) 203-5402 - (301) 203-5499 | 53 |
| (301) 203-55** | (301) 203-5500 - (301) 203-5599 | 66 |
| (301) 203-56** | (301) 203-5600 - (301) 203-5699 | 59 |
| (301) 203-57** | (301) 203-5701 - (301) 203-5799 | 61 |
| (301) 203-58** | (301) 203-5803 - (301) 203-5841 | 19 |
| (301) 203-59** | (301) 203-5900 - (301) 203-5999 | 64 |
US Phone Directory: (301) 203-5***
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