| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 277-20** | (301) 277-2001 - (301) 277-2097 | 82 |
| (301) 277-21** | (301) 277-2100 - (301) 277-2198 | 77 |
| (301) 277-22** | (301) 277-2201 - (301) 277-2299 | 66 |
| (301) 277-23** | (301) 277-2301 - (301) 277-2399 | 80 |
| (301) 277-24** | (301) 277-2400 - (301) 277-2499 | 73 |
| (301) 277-25** | (301) 277-2500 - (301) 277-2599 | 74 |
| (301) 277-26** | (301) 277-2606 - (301) 277-2699 | 68 |
| (301) 277-27** | (301) 277-2700 - (301) 277-2799 | 79 |
| (301) 277-28** | (301) 277-2800 - (301) 277-2899 | 71 |
| (301) 277-29** | (301) 277-2901 - (301) 277-2999 | 85 |
US Phone Directory: (301) 277-2***
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