| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 528-20** | (301) 528-2000 - (301) 528-2089 | 77 |
| (301) 528-21** | (301) 528-2118 - (301) 528-2199 | 65 |
| (301) 528-22** | (301) 528-2200 - (301) 528-2299 | 83 |
| (301) 528-23** | (301) 528-2300 - (301) 528-2399 | 74 |
| (301) 528-24** | (301) 528-2401 - (301) 528-2499 | 74 |
| (301) 528-25** | (301) 528-2500 - (301) 528-2596 | 80 |
| (301) 528-26** | (301) 528-2600 - (301) 528-2699 | 79 |
| (301) 528-27** | (301) 528-2701 - (301) 528-2799 | 75 |
| (301) 528-28** | (301) 528-2800 - (301) 528-2899 | 79 |
| (301) 528-29** | (301) 528-2902 - (301) 528-2999 | 80 |
US Phone Directory: (301) 528-2***
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