| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 283-60** | (301) 283-6000 - (301) 283-6099 | 64 |
| (301) 283-61** | (301) 283-6101 - (301) 283-6199 | 51 |
| (301) 283-62** | (301) 283-6200 - (301) 283-6299 | 58 |
| (301) 283-63** | (301) 283-6300 - (301) 283-6399 | 63 |
| (301) 283-64** | (301) 283-6400 - (301) 283-6499 | 57 |
| (301) 283-65** | (301) 283-6501 - (301) 283-6596 | 60 |
| (301) 283-66** | (301) 283-6600 - (301) 283-6699 | 54 |
| (301) 283-67** | (301) 283-6703 - (301) 283-6798 | 57 |
| (301) 283-68** | (301) 283-6801 - (301) 283-6889 | 52 |
| (301) 283-69** | (301) 283-6900 - (301) 283-6998 | 53 |
US Phone Directory: (301) 283-6***
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