| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 497-10** | (301) 497-1001 - (301) 497-1097 | 21 |
| (301) 497-11** | (301) 497-1100 - (301) 497-1198 | 74 |
| (301) 497-12** | (301) 497-1217 - (301) 497-1292 | 19 |
| (301) 497-13** | (301) 497-1300 - (301) 497-1399 | 22 |
| (301) 497-14** | (301) 497-1418 - (301) 497-1498 | 15 |
| (301) 497-15** | (301) 497-1500 - (301) 497-1599 | 67 |
| (301) 497-16** | (301) 497-1600 - (301) 497-1699 | 65 |
| (301) 497-17** | (301) 497-1700 - (301) 497-1799 | 16 |
| (301) 497-18** | (301) 497-1801 - (301) 497-1899 | 65 |
| (301) 497-19** | (301) 497-1900 - (301) 497-1999 | 82 |
US Phone Directory: (301) 497-1***
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