| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 528-50** | (301) 528-5000 - (301) 528-5098 | 70 |
| (301) 528-51** | (301) 528-5100 - (301) 528-5199 | 74 |
| (301) 528-52** | (301) 528-5200 - (301) 528-5299 | 80 |
| (301) 528-53** | (301) 528-5301 - (301) 528-5399 | 79 |
| (301) 528-54** | (301) 528-5401 - (301) 528-5498 | 74 |
| (301) 528-55** | (301) 528-5500 - (301) 528-5599 | 76 |
| (301) 528-56** | (301) 528-5600 - (301) 528-5699 | 80 |
| (301) 528-57** | (301) 528-5704 - (301) 528-5799 | 77 |
| (301) 528-58** | (301) 528-5800 - (301) 528-5897 | 76 |
| (301) 528-59** | (301) 528-5900 - (301) 528-5997 | 80 |
US Phone Directory: (301) 528-5***
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