| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (410) 203-10** | (410) 203-1000 - (410) 203-1099 | 82 |
| (410) 203-11** | (410) 203-1100 - (410) 203-1199 | 72 |
| (410) 203-12** | (410) 203-1200 - (410) 203-1299 | 52 |
| (410) 203-13** | (410) 203-1300 - (410) 203-1396 | 72 |
| (410) 203-14** | (410) 203-1400 - (410) 203-1499 | 80 |
| (410) 203-15** | (410) 203-1500 - (410) 203-1599 | 87 |
| (410) 203-16** | (410) 203-1600 - (410) 203-1699 | 77 |
| (410) 203-17** | (410) 203-1700 - (410) 203-1799 | 72 |
| (410) 203-18** | (410) 203-1800 - (410) 203-1899 | 78 |
| (410) 203-19** | (410) 203-1900 - (410) 203-1999 | 82 |
US Phone Directory: (410) 203-1***
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