| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 977-50** | (301) 977-5000 - (301) 977-5099 | 83 |
| (301) 977-51** | (301) 977-5100 - (301) 977-5199 | 82 |
| (301) 977-52** | (301) 977-5200 - (301) 977-5299 | 77 |
| (301) 977-53** | (301) 977-5300 - (301) 977-5399 | 78 |
| (301) 977-54** | (301) 977-5401 - (301) 977-5498 | 85 |
| (301) 977-55** | (301) 977-5501 - (301) 977-5599 | 79 |
| (301) 977-56** | (301) 977-5601 - (301) 977-5699 | 75 |
| (301) 977-57** | (301) 977-5700 - (301) 977-5796 | 79 |
| (301) 977-58** | (301) 977-5801 - (301) 977-5899 | 82 |
| (301) 977-59** | (301) 977-5900 - (301) 977-5999 | 82 |
US Phone Directory: (301) 977-5***
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