| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 428-10** | (301) 428-1000 - (301) 428-1092 | 52 |
| (301) 428-12** | (301) 428-1258 - (301) 428-1262 | 2 |
| (301) 428-13** | (301) 428-1300 - (301) 428-1397 | 32 |
| (301) 428-14** | (301) 428-1402 - (301) 428-1493 | 55 |
| (301) 428-15** | (301) 428-1500 - (301) 428-1595 | 34 |
| (301) 428-16** | (301) 428-1623 - (301) 428-1627 | 2 |
| (301) 428-17** | (301) 428-1700 - (301) 428-1798 | 53 |
| (301) 428-18** | (301) 428-1801 - (301) 428-1899 | 56 |
| (301) 428-19** | (301) 428-1901 - (301) 428-1998 | 52 |
US Phone Directory: (301) 428-1***
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