| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 378-20** | (301) 378-2000 - (301) 378-2099 | 80 |
| (301) 378-21** | (301) 378-2101 - (301) 378-2199 | 85 |
| (301) 378-22** | (301) 378-2200 - (301) 378-2299 | 84 |
| (301) 378-23** | (301) 378-2300 - (301) 378-2399 | 81 |
| (301) 378-24** | (301) 378-2401 - (301) 378-2499 | 53 |
| (301) 378-25** | (301) 378-2500 - (301) 378-2599 | 62 |
| (301) 378-26** | (301) 378-2602 - (301) 378-2693 | 40 |
| (301) 378-27** | (301) 378-2703 - (301) 378-2799 | 51 |
| (301) 378-28** | (301) 378-2800 - (301) 378-2895 | 26 |
| (301) 378-29** | (301) 378-2900 - (301) 378-2959 | 18 |
US Phone Directory: (301) 378-2***
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