| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 645-60** | (301) 645-6000 - (301) 645-6099 | 81 |
| (301) 645-61** | (301) 645-6105 - (301) 645-6198 | 79 |
| (301) 645-62** | (301) 645-6200 - (301) 645-6299 | 79 |
| (301) 645-63** | (301) 645-6300 - (301) 645-6399 | 78 |
| (301) 645-64** | (301) 645-6400 - (301) 645-6498 | 70 |
| (301) 645-65** | (301) 645-6500 - (301) 645-6596 | 76 |
| (301) 645-66** | (301) 645-6600 - (301) 645-6698 | 79 |
| (301) 645-67** | (301) 645-6700 - (301) 645-6799 | 76 |
| (301) 645-68** | (301) 645-6800 - (301) 645-6899 | 71 |
| (301) 645-69** | (301) 645-6900 - (301) 645-6999 | 74 |
US Phone Directory: (301) 645-6***
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