| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 621-60** | (301) 621-6015 - (301) 621-6088 | 6 |
| (301) 621-61** | (301) 621-6120 - (301) 621-6164 | 6 |
| (301) 621-62** | (301) 621-6202 - (301) 621-6251 | 11 |
| (301) 621-63** | (301) 621-6306 - (301) 621-6377 | 4 |
| (301) 621-64** | (301) 621-6422 - (301) 621-6460 | 5 |
| (301) 621-65** | (301) 621-6500 - (301) 621-6584 | 6 |
| (301) 621-66** | (301) 621-6608 - (301) 621-6679 | 5 |
| (301) 621-67** | (301) 621-6700 - (301) 621-6738 | 5 |
| (301) 621-69** | (301) 621-6900 - (301) 621-6900 | 1 |
US Phone Directory: (301) 621-6***
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