| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 621-10** | (301) 621-1000 - (301) 621-1098 | 23 |
| (301) 621-11** | (301) 621-1100 - (301) 621-1191 | 24 |
| (301) 621-12** | (301) 621-1202 - (301) 621-1295 | 16 |
| (301) 621-13** | (301) 621-1313 - (301) 621-1394 | 9 |
| (301) 621-14** | (301) 621-1400 - (301) 621-1459 | 15 |
| (301) 621-15** | (301) 621-1500 - (301) 621-1595 | 9 |
| (301) 621-16** | (301) 621-1600 - (301) 621-1691 | 11 |
| (301) 621-17** | (301) 621-1713 - (301) 621-1780 | 14 |
| (301) 621-18** | (301) 621-1810 - (301) 621-1890 | 12 |
| (301) 621-19** | (301) 621-1904 - (301) 621-1999 | 10 |
US Phone Directory: (301) 621-1***
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