| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 604-60** | (301) 604-6004 - (301) 604-6099 | 69 |
| (301) 604-61** | (301) 604-6110 - (301) 604-6199 | 63 |
| (301) 604-62** | (301) 604-6200 - (301) 604-6299 | 68 |
| (301) 604-63** | (301) 604-6302 - (301) 604-6399 | 67 |
| (301) 604-64** | (301) 604-6400 - (301) 604-6498 | 61 |
| (301) 604-65** | (301) 604-6500 - (301) 604-6599 | 69 |
| (301) 604-66** | (301) 604-6600 - (301) 604-6699 | 74 |
| (301) 604-67** | (301) 604-6700 - (301) 604-6799 | 70 |
| (301) 604-68** | (301) 604-6800 - (301) 604-6899 | 68 |
| (301) 604-69** | (301) 604-6902 - (301) 604-6999 | 73 |
US Phone Directory: (301) 604-6***
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