| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (410) 721-10** | (410) 721-1000 - (410) 721-1099 | 82 |
| (410) 721-11** | (410) 721-1100 - (410) 721-1199 | 93 |
| (410) 721-12** | (410) 721-1200 - (410) 721-1298 | 85 |
| (410) 721-13** | (410) 721-1300 - (410) 721-1399 | 87 |
| (410) 721-14** | (410) 721-1400 - (410) 721-1498 | 78 |
| (410) 721-15** | (410) 721-1500 - (410) 721-1599 | 80 |
| (410) 721-16** | (410) 721-1600 - (410) 721-1699 | 82 |
| (410) 721-17** | (410) 721-1700 - (410) 721-1799 | 88 |
| (410) 721-18** | (410) 721-1800 - (410) 721-1899 | 91 |
| (410) 721-19** | (410) 721-1902 - (410) 721-1998 | 86 |
US Phone Directory: (410) 721-1***
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