| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 266-60** | (301) 266-6000 - (301) 266-6097 | 20 |
| (301) 266-61** | (301) 266-6104 - (301) 266-6186 | 20 |
| (301) 266-62** | (301) 266-6202 - (301) 266-6299 | 22 |
| (301) 266-63** | (301) 266-6302 - (301) 266-6399 | 26 |
| (301) 266-64** | (301) 266-6403 - (301) 266-6498 | 17 |
| (301) 266-65** | (301) 266-6503 - (301) 266-6596 | 19 |
| (301) 266-66** | (301) 266-6600 - (301) 266-6698 | 19 |
| (301) 266-67** | (301) 266-6703 - (301) 266-6798 | 23 |
| (301) 266-68** | (301) 266-6800 - (301) 266-6898 | 26 |
| (301) 266-69** | (301) 266-6902 - (301) 266-6999 | 23 |
US Phone Directory: (301) 266-6***
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