| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 663-10** | (301) 663-1000 - (301) 663-1099 | 78 |
| (301) 663-11** | (301) 663-1100 - (301) 663-1199 | 64 |
| (301) 663-12** | (301) 663-1203 - (301) 663-1298 | 73 |
| (301) 663-13** | (301) 663-1300 - (301) 663-1398 | 78 |
| (301) 663-14** | (301) 663-1403 - (301) 663-1499 | 66 |
| (301) 663-15** | (301) 663-1500 - (301) 663-1598 | 72 |
| (301) 663-16** | (301) 663-1600 - (301) 663-1699 | 72 |
| (301) 663-17** | (301) 663-1700 - (301) 663-1799 | 73 |
| (301) 663-18** | (301) 663-1801 - (301) 663-1899 | 66 |
| (301) 663-19** | (301) 663-1900 - (301) 663-1999 | 77 |
US Phone Directory: (301) 663-1***
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