| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (410) 820-50** | (410) 820-5000 - (410) 820-5099 | 66 |
| (410) 820-51** | (410) 820-5102 - (410) 820-5199 | 67 |
| (410) 820-52** | (410) 820-5200 - (410) 820-5299 | 60 |
| (410) 820-53** | (410) 820-5397 - (410) 820-5397 | 1 |
| (410) 820-54** | (410) 820-5433 - (410) 820-5433 | 1 |
| (410) 820-55** | (410) 820-5500 - (410) 820-5599 | 58 |
| (410) 820-56** | (410) 820-5600 - (410) 820-5698 | 57 |
| (410) 820-57** | (410) 820-5703 - (410) 820-5799 | 54 |
| (410) 820-58** | (410) 820-5800 - (410) 820-5898 | 59 |
| (410) 820-59** | (410) 820-5900 - (410) 820-5998 | 66 |
US Phone Directory: (410) 820-5***
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