| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 464-50** | (301) 464-5000 - (301) 464-5099 | 80 |
| (301) 464-51** | (301) 464-5100 - (301) 464-5199 | 68 |
| (301) 464-52** | (301) 464-5200 - (301) 464-5299 | 82 |
| (301) 464-53** | (301) 464-5304 - (301) 464-5399 | 69 |
| (301) 464-54** | (301) 464-5401 - (301) 464-5498 | 72 |
| (301) 464-55** | (301) 464-5500 - (301) 464-5599 | 70 |
| (301) 464-56** | (301) 464-5600 - (301) 464-5699 | 77 |
| (301) 464-57** | (301) 464-5700 - (301) 464-5798 | 76 |
| (301) 464-58** | (301) 464-5800 - (301) 464-5899 | 76 |
| (301) 464-59** | (301) 464-5900 - (301) 464-5999 | 73 |
US Phone Directory: (301) 464-5***
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