| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 728-00** | (301) 728-0002 - (301) 728-0087 | 4 |
| (301) 728-01** | (301) 728-0105 - (301) 728-0194 | 16 |
| (301) 728-02** | (301) 728-0203 - (301) 728-0289 | 12 |
| (301) 728-03** | (301) 728-0313 - (301) 728-0392 | 6 |
| (301) 728-04** | (301) 728-0409 - (301) 728-0494 | 8 |
| (301) 728-05** | (301) 728-0513 - (301) 728-0597 | 10 |
| (301) 728-06** | (301) 728-0611 - (301) 728-0699 | 16 |
| (301) 728-07** | (301) 728-0715 - (301) 728-0794 | 11 |
| (301) 728-08** | (301) 728-0805 - (301) 728-0890 | 9 |
| (301) 728-09** | (301) 728-0901 - (301) 728-0990 | 13 |
US Phone Directory: (301) 728-0***
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