| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 340-60** | (301) 340-6000 - (301) 340-6098 | 65 |
| (301) 340-61** | (301) 340-6100 - (301) 340-6199 | 51 |
| (301) 340-62** | (301) 340-6201 - (301) 340-6297 | 65 |
| (301) 340-63** | (301) 340-6300 - (301) 340-6398 | 52 |
| (301) 340-64** | (301) 340-6400 - (301) 340-6499 | 62 |
| (301) 340-65** | (301) 340-6500 - (301) 340-6598 | 54 |
| (301) 340-66** | (301) 340-6600 - (301) 340-6699 | 71 |
| (301) 340-67** | (301) 340-6700 - (301) 340-6799 | 60 |
| (301) 340-68** | (301) 340-6800 - (301) 340-6898 | 60 |
| (301) 340-69** | (301) 340-6902 - (301) 340-6999 | 55 |
US Phone Directory: (301) 340-6***
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