| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 420-10** | (301) 420-1000 - (301) 420-1098 | 74 |
| (301) 420-11** | (301) 420-1100 - (301) 420-1198 | 67 |
| (301) 420-12** | (301) 420-1201 - (301) 420-1299 | 77 |
| (301) 420-13** | (301) 420-1300 - (301) 420-1399 | 75 |
| (301) 420-14** | (301) 420-1401 - (301) 420-1499 | 72 |
| (301) 420-15** | (301) 420-1500 - (301) 420-1598 | 73 |
| (301) 420-16** | (301) 420-1600 - (301) 420-1699 | 66 |
| (301) 420-17** | (301) 420-1700 - (301) 420-1799 | 69 |
| (301) 420-18** | (301) 420-1800 - (301) 420-1898 | 78 |
| (301) 420-19** | (301) 420-1900 - (301) 420-1999 | 77 |
US Phone Directory: (301) 420-1***
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