| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 330-50** | (301) 330-5000 - (301) 330-5099 | 79 |
| (301) 330-51** | (301) 330-5100 - (301) 330-5199 | 81 |
| (301) 330-52** | (301) 330-5200 - (301) 330-5299 | 78 |
| (301) 330-53** | (301) 330-5300 - (301) 330-5399 | 86 |
| (301) 330-54** | (301) 330-5400 - (301) 330-5499 | 84 |
| (301) 330-55** | (301) 330-5500 - (301) 330-5599 | 83 |
| (301) 330-56** | (301) 330-5600 - (301) 330-5699 | 79 |
| (301) 330-57** | (301) 330-5700 - (301) 330-5799 | 81 |
| (301) 330-58** | (301) 330-5800 - (301) 330-5897 | 74 |
| (301) 330-59** | (301) 330-5900 - (301) 330-5999 | 78 |
US Phone Directory: (301) 330-5***
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