| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 604-20** | (301) 604-2000 - (301) 604-2099 | 66 |
| (301) 604-21** | (301) 604-2100 - (301) 604-2199 | 65 |
| (301) 604-22** | (301) 604-2205 - (301) 604-2299 | 56 |
| (301) 604-23** | (301) 604-2300 - (301) 604-2397 | 65 |
| (301) 604-24** | (301) 604-2400 - (301) 604-2499 | 70 |
| (301) 604-25** | (301) 604-2500 - (301) 604-2599 | 55 |
| (301) 604-26** | (301) 604-2600 - (301) 604-2699 | 69 |
| (301) 604-27** | (301) 604-2700 - (301) 604-2798 | 68 |
| (301) 604-28** | (301) 604-2800 - (301) 604-2898 | 63 |
| (301) 604-29** | (301) 604-2901 - (301) 604-2999 | 55 |
US Phone Directory: (301) 604-2***
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