| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (410) 531-50** | (410) 531-5000 - (410) 531-5099 | 80 |
| (410) 531-51** | (410) 531-5101 - (410) 531-5199 | 88 |
| (410) 531-52** | (410) 531-5200 - (410) 531-5299 | 89 |
| (410) 531-53** | (410) 531-5300 - (410) 531-5399 | 79 |
| (410) 531-54** | (410) 531-5401 - (410) 531-5499 | 84 |
| (410) 531-55** | (410) 531-5500 - (410) 531-5599 | 71 |
| (410) 531-56** | (410) 531-5601 - (410) 531-5699 | 79 |
| (410) 531-57** | (410) 531-5700 - (410) 531-5799 | 79 |
| (410) 531-58** | (410) 531-5800 - (410) 531-5899 | 82 |
| (410) 531-59** | (410) 531-5900 - (410) 531-5999 | 86 |
US Phone Directory: (410) 531-5***
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