| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 620-10** | (301) 620-1000 - (301) 620-1098 | 38 |
| (301) 620-11** | (301) 620-1100 - (301) 620-1199 | 79 |
| (301) 620-12** | (301) 620-1200 - (301) 620-1299 | 80 |
| (301) 620-13** | (301) 620-1300 - (301) 620-1399 | 72 |
| (301) 620-14** | (301) 620-1400 - (301) 620-1499 | 72 |
| (301) 620-15** | (301) 620-1500 - (301) 620-1599 | 67 |
| (301) 620-16** | (301) 620-1600 - (301) 620-1698 | 76 |
| (301) 620-17** | (301) 620-1700 - (301) 620-1797 | 70 |
| (301) 620-18** | (301) 620-1800 - (301) 620-1899 | 74 |
| (301) 620-19** | (301) 620-1901 - (301) 620-1999 | 78 |
US Phone Directory: (301) 620-1***
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