| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 670-70** | (301) 670-7001 - (301) 670-7099 | 14 |
| (301) 670-71** | (301) 670-7100 - (301) 670-7183 | 4 |
| (301) 670-73** | (301) 670-7300 - (301) 670-7390 | 9 |
| (301) 670-75** | (301) 670-7575 - (301) 670-7575 | 1 |
| (301) 670-76** | (301) 670-7660 - (301) 670-7660 | 1 |
| (301) 670-78** | (301) 670-7838 - (301) 670-7899 | 13 |
| (301) 670-79** | (301) 670-7900 - (301) 670-7999 | 24 |
US Phone Directory: (301) 670-7***
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