| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 728-30** | (301) 728-3008 - (301) 728-3085 | 11 |
| (301) 728-31** | (301) 728-3100 - (301) 728-3189 | 7 |
| (301) 728-32** | (301) 728-3224 - (301) 728-3297 | 11 |
| (301) 728-33** | (301) 728-3308 - (301) 728-3358 | 5 |
| (301) 728-34** | (301) 728-3405 - (301) 728-3497 | 13 |
| (301) 728-35** | (301) 728-3523 - (301) 728-3597 | 10 |
| (301) 728-36** | (301) 728-3601 - (301) 728-3667 | 7 |
| (301) 728-37** | (301) 728-3700 - (301) 728-3799 | 9 |
| (301) 728-38** | (301) 728-3812 - (301) 728-3885 | 11 |
| (301) 728-39** | (301) 728-3908 - (301) 728-3974 | 10 |
US Phone Directory: (301) 728-3***
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