| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 434-50** | (301) 434-5000 - (301) 434-5099 | 70 |
| (301) 434-51** | (301) 434-5100 - (301) 434-5193 | 63 |
| (301) 434-52** | (301) 434-5200 - (301) 434-5299 | 69 |
| (301) 434-53** | (301) 434-5300 - (301) 434-5399 | 75 |
| (301) 434-54** | (301) 434-5400 - (301) 434-5499 | 71 |
| (301) 434-55** | (301) 434-5500 - (301) 434-5599 | 78 |
| (301) 434-56** | (301) 434-5600 - (301) 434-5699 | 76 |
| (301) 434-57** | (301) 434-5700 - (301) 434-5799 | 61 |
| (301) 434-58** | (301) 434-5800 - (301) 434-5899 | 67 |
| (301) 434-59** | (301) 434-5900 - (301) 434-5999 | 71 |
US Phone Directory: (301) 434-5***
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