| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 387-90** | (301) 387-9000 - (301) 387-9099 | 83 |
| (301) 387-91** | (301) 387-9100 - (301) 387-9199 | 84 |
| (301) 387-92** | (301) 387-9200 - (301) 387-9299 | 78 |
| (301) 387-93** | (301) 387-9301 - (301) 387-9399 | 82 |
| (301) 387-94** | (301) 387-9400 - (301) 387-9499 | 82 |
| (301) 387-95** | (301) 387-9501 - (301) 387-9599 | 79 |
| (301) 387-96** | (301) 387-9600 - (301) 387-9698 | 78 |
| (301) 387-97** | (301) 387-9759 - (301) 387-9759 | 1 |
| (301) 387-98** | (301) 387-9801 - (301) 387-9899 | 70 |
| (301) 387-99** | (301) 387-9913 - (301) 387-9986 | 4 |
US Phone Directory: (301) 387-9***
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