| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 387-20** | (301) 387-2000 - (301) 387-2099 | 80 |
| (301) 387-21** | (301) 387-2101 - (301) 387-2199 | 83 |
| (301) 387-22** | (301) 387-2200 - (301) 387-2299 | 79 |
| (301) 387-23** | (301) 387-2300 - (301) 387-2398 | 83 |
| (301) 387-24** | (301) 387-2400 - (301) 387-2499 | 85 |
| (301) 387-25** | (301) 387-2500 - (301) 387-2599 | 84 |
| (301) 387-26** | (301) 387-2600 - (301) 387-2699 | 86 |
| (301) 387-27** | (301) 387-2700 - (301) 387-2799 | 92 |
| (301) 387-28** | (301) 387-2800 - (301) 387-2899 | 86 |
| (301) 387-29** | (301) 387-2900 - (301) 387-2999 | 75 |
US Phone Directory: (301) 387-2***
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