| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 565-20** | (301) 565-2000 - (301) 565-2099 | 55 |
| (301) 565-21** | (301) 565-2100 - (301) 565-2199 | 54 |
| (301) 565-22** | (301) 565-2200 - (301) 565-2299 | 53 |
| (301) 565-23** | (301) 565-2300 - (301) 565-2399 | 50 |
| (301) 565-24** | (301) 565-2400 - (301) 565-2499 | 61 |
| (301) 565-25** | (301) 565-2500 - (301) 565-2599 | 55 |
| (301) 565-26** | (301) 565-2600 - (301) 565-2697 | 48 |
| (301) 565-27** | (301) 565-2700 - (301) 565-2796 | 43 |
| (301) 565-28** | (301) 565-2800 - (301) 565-2899 | 49 |
| (301) 565-29** | (301) 565-2900 - (301) 565-2995 | 53 |
US Phone Directory: (301) 565-2***
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