| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 639-90** | (301) 639-9002 - (301) 639-9090 | 32 |
| (301) 639-91** | (301) 639-9100 - (301) 639-9196 | 32 |
| (301) 639-92** | (301) 639-9201 - (301) 639-9298 | 25 |
| (301) 639-93** | (301) 639-9300 - (301) 639-9396 | 37 |
| (301) 639-94** | (301) 639-9403 - (301) 639-9499 | 38 |
| (301) 639-95** | (301) 639-9500 - (301) 639-9597 | 31 |
| (301) 639-96** | (301) 639-9619 - (301) 639-9694 | 27 |
| (301) 639-97** | (301) 639-9703 - (301) 639-9799 | 41 |
| (301) 639-98** | (301) 639-9803 - (301) 639-9898 | 31 |
| (301) 639-99** | (301) 639-9902 - (301) 639-9997 | 43 |
US Phone Directory: (301) 639-9***
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