| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 633-10** | (301) 633-1009 - (301) 633-1092 | 7 |
| (301) 633-11** | (301) 633-1120 - (301) 633-1172 | 5 |
| (301) 633-12** | (301) 633-1217 - (301) 633-1296 | 7 |
| (301) 633-13** | (301) 633-1323 - (301) 633-1399 | 5 |
| (301) 633-14** | (301) 633-1419 - (301) 633-1491 | 14 |
| (301) 633-15** | (301) 633-1511 - (301) 633-1586 | 11 |
| (301) 633-16** | (301) 633-1601 - (301) 633-1685 | 5 |
| (301) 633-17** | (301) 633-1719 - (301) 633-1769 | 3 |
| (301) 633-18** | (301) 633-1801 - (301) 633-1897 | 10 |
| (301) 633-19** | (301) 633-1903 - (301) 633-1993 | 4 |
US Phone Directory: (301) 633-1***
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