| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 645-20** | (301) 645-2000 - (301) 645-2099 | 72 |
| (301) 645-21** | (301) 645-2100 - (301) 645-2199 | 83 |
| (301) 645-22** | (301) 645-2200 - (301) 645-2299 | 82 |
| (301) 645-23** | (301) 645-2300 - (301) 645-2399 | 83 |
| (301) 645-24** | (301) 645-2400 - (301) 645-2499 | 78 |
| (301) 645-25** | (301) 645-2500 - (301) 645-2599 | 75 |
| (301) 645-26** | (301) 645-2601 - (301) 645-2699 | 77 |
| (301) 645-27** | (301) 645-2700 - (301) 645-2799 | 76 |
| (301) 645-28** | (301) 645-2800 - (301) 645-2898 | 80 |
| (301) 645-29** | (301) 645-2900 - (301) 645-2999 | 80 |
US Phone Directory: (301) 645-2***
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