| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 638-10** | (301) 638-1001 - (301) 638-1099 | 83 |
| (301) 638-11** | (301) 638-1100 - (301) 638-1199 | 77 |
| (301) 638-12** | (301) 638-1201 - (301) 638-1299 | 73 |
| (301) 638-13** | (301) 638-1300 - (301) 638-1399 | 82 |
| (301) 638-14** | (301) 638-1400 - (301) 638-1499 | 72 |
| (301) 638-15** | (301) 638-1500 - (301) 638-1599 | 75 |
| (301) 638-16** | (301) 638-1600 - (301) 638-1698 | 76 |
| (301) 638-17** | (301) 638-1700 - (301) 638-1799 | 79 |
| (301) 638-18** | (301) 638-1800 - (301) 638-1899 | 83 |
| (301) 638-19** | (301) 638-1900 - (301) 638-1998 | 82 |
US Phone Directory: (301) 638-1***
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