| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 277-90** | (301) 277-9000 - (301) 277-9094 | 56 |
| (301) 277-91** | (301) 277-9100 - (301) 277-9197 | 57 |
| (301) 277-92** | (301) 277-9200 - (301) 277-9299 | 58 |
| (301) 277-93** | (301) 277-9303 - (301) 277-9396 | 51 |
| (301) 277-94** | (301) 277-9400 - (301) 277-9499 | 61 |
| (301) 277-95** | (301) 277-9500 - (301) 277-9596 | 42 |
| (301) 277-96** | (301) 277-9600 - (301) 277-9698 | 38 |
| (301) 277-97** | (301) 277-9700 - (301) 277-9799 | 23 |
| (301) 277-98** | (301) 277-9800 - (301) 277-9896 | 28 |
US Phone Directory: (301) 277-9***
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