| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 530-60** | (301) 530-6000 - (301) 530-6098 | 68 |
| (301) 530-61** | (301) 530-6100 - (301) 530-6199 | 72 |
| (301) 530-62** | (301) 530-6200 - (301) 530-6299 | 81 |
| (301) 530-63** | (301) 530-6300 - (301) 530-6399 | 74 |
| (301) 530-64** | (301) 530-6400 - (301) 530-6498 | 65 |
| (301) 530-65** | (301) 530-6500 - (301) 530-6599 | 74 |
| (301) 530-66** | (301) 530-6600 - (301) 530-6699 | 75 |
| (301) 530-67** | (301) 530-6700 - (301) 530-6799 | 74 |
| (301) 530-68** | (301) 530-6800 - (301) 530-6898 | 70 |
| (301) 530-69** | (301) 530-6900 - (301) 530-6999 | 76 |
US Phone Directory: (301) 530-6***
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