| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 324-10** | (301) 324-1000 - (301) 324-1096 | 55 |
| (301) 324-11** | (301) 324-1100 - (301) 324-1197 | 53 |
| (301) 324-12** | (301) 324-1205 - (301) 324-1297 | 55 |
| (301) 324-13** | (301) 324-1300 - (301) 324-1398 | 73 |
| (301) 324-14** | (301) 324-1400 - (301) 324-1499 | 61 |
| (301) 324-15** | (301) 324-1500 - (301) 324-1599 | 62 |
| (301) 324-16** | (301) 324-1600 - (301) 324-1699 | 65 |
| (301) 324-17** | (301) 324-1700 - (301) 324-1797 | 60 |
| (301) 324-18** | (301) 324-1800 - (301) 324-1898 | 58 |
| (301) 324-19** | (301) 324-1900 - (301) 324-1996 | 50 |
US Phone Directory: (301) 324-1***
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