| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 574-20** | (301) 574-2000 - (301) 574-2099 | 61 |
| (301) 574-21** | (301) 574-2100 - (301) 574-2197 | 59 |
| (301) 574-22** | (301) 574-2201 - (301) 574-2299 | 65 |
| (301) 574-23** | (301) 574-2300 - (301) 574-2397 | 58 |
| (301) 574-24** | (301) 574-2400 - (301) 574-2499 | 56 |
| (301) 574-25** | (301) 574-2504 - (301) 574-2599 | 49 |
| (301) 574-26** | (301) 574-2601 - (301) 574-2697 | 62 |
| (301) 574-27** | (301) 574-2700 - (301) 574-2799 | 60 |
| (301) 574-28** | (301) 574-2800 - (301) 574-2899 | 52 |
| (301) 574-29** | (301) 574-2901 - (301) 574-2999 | 57 |
US Phone Directory: (301) 574-2***
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