| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (410) 551-50** | (410) 551-5000 - (410) 551-5098 | 77 |
| (410) 551-51** | (410) 551-5100 - (410) 551-5199 | 85 |
| (410) 551-52** | (410) 551-5200 - (410) 551-5299 | 85 |
| (410) 551-53** | (410) 551-5300 - (410) 551-5399 | 83 |
| (410) 551-54** | (410) 551-5400 - (410) 551-5499 | 83 |
| (410) 551-55** | (410) 551-5500 - (410) 551-5598 | 83 |
| (410) 551-56** | (410) 551-5603 - (410) 551-5699 | 89 |
| (410) 551-57** | (410) 551-5700 - (410) 551-5799 | 73 |
| (410) 551-58** | (410) 551-5800 - (410) 551-5899 | 83 |
| (410) 551-59** | (410) 551-5900 - (410) 551-5999 | 91 |
US Phone Directory: (410) 551-5***
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