| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 670-60** | (301) 670-6000 - (301) 670-6084 | 8 |
| (301) 670-61** | (301) 670-6100 - (301) 670-6190 | 28 |
| (301) 670-62** | (301) 670-6241 - (301) 670-6299 | 15 |
| (301) 670-63** | (301) 670-6300 - (301) 670-6399 | 30 |
| (301) 670-64** | (301) 670-6476 - (301) 670-6485 | 2 |
| (301) 670-66** | (301) 670-6600 - (301) 670-6648 | 2 |
| (301) 670-67** | (301) 670-6700 - (301) 670-6799 | 34 |
| (301) 670-68** | (301) 670-6840 - (301) 670-6898 | 21 |
| (301) 670-69** | (301) 670-6900 - (301) 670-6999 | 43 |
US Phone Directory: (301) 670-6***
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