| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 831-60** | (301) 831-6002 - (301) 831-6099 | 79 |
| (301) 831-61** | (301) 831-6100 - (301) 831-6198 | 83 |
| (301) 831-62** | (301) 831-6200 - (301) 831-6299 | 76 |
| (301) 831-63** | (301) 831-6300 - (301) 831-6398 | 77 |
| (301) 831-64** | (301) 831-6400 - (301) 831-6499 | 85 |
| (301) 831-65** | (301) 831-6500 - (301) 831-6598 | 84 |
| (301) 831-66** | (301) 831-6600 - (301) 831-6699 | 83 |
| (301) 831-67** | (301) 831-6700 - (301) 831-6797 | 75 |
| (301) 831-68** | (301) 831-6800 - (301) 831-6899 | 75 |
| (301) 831-69** | (301) 831-6900 - (301) 831-6999 | 86 |
US Phone Directory: (301) 831-6***
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