| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 670-30** | (301) 670-3000 - (301) 670-3024 | 6 |
| (301) 670-31** | (301) 670-3140 - (301) 670-3140 | 1 |
| (301) 670-32** | (301) 670-3223 - (301) 670-3245 | 13 |
| (301) 670-33** | (301) 670-3313 - (301) 670-3347 | 2 |
| (301) 670-34** | (301) 670-3423 - (301) 670-3478 | 9 |
| (301) 670-35** | (301) 670-3500 - (301) 670-3599 | 3 |
| (301) 670-37** | (301) 670-3732 - (301) 670-3732 | 1 |
| (301) 670-38** | (301) 670-3800 - (301) 670-3891 | 31 |
| (301) 670-39** | (301) 670-3900 - (301) 670-3949 | 8 |
US Phone Directory: (301) 670-3***
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