| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 728-40** | (301) 728-4003 - (301) 728-4088 | 7 |
| (301) 728-41** | (301) 728-4113 - (301) 728-4186 | 12 |
| (301) 728-42** | (301) 728-4202 - (301) 728-4296 | 9 |
| (301) 728-43** | (301) 728-4305 - (301) 728-4387 | 14 |
| (301) 728-44** | (301) 728-4400 - (301) 728-4499 | 16 |
| (301) 728-45** | (301) 728-4517 - (301) 728-4587 | 4 |
| (301) 728-46** | (301) 728-4601 - (301) 728-4683 | 8 |
| (301) 728-47** | (301) 728-4710 - (301) 728-4797 | 12 |
| (301) 728-48** | (301) 728-4815 - (301) 728-4898 | 11 |
| (301) 728-49** | (301) 728-4922 - (301) 728-4941 | 5 |
US Phone Directory: (301) 728-4***
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