| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 423-20** | (301) 423-2000 - (301) 423-2098 | 68 |
| (301) 423-21** | (301) 423-2100 - (301) 423-2199 | 75 |
| (301) 423-22** | (301) 423-2200 - (301) 423-2298 | 67 |
| (301) 423-23** | (301) 423-2300 - (301) 423-2399 | 68 |
| (301) 423-24** | (301) 423-2400 - (301) 423-2499 | 66 |
| (301) 423-25** | (301) 423-2501 - (301) 423-2598 | 66 |
| (301) 423-26** | (301) 423-2600 - (301) 423-2698 | 66 |
| (301) 423-27** | (301) 423-2700 - (301) 423-2799 | 68 |
| (301) 423-28** | (301) 423-2800 - (301) 423-2899 | 75 |
| (301) 423-29** | (301) 423-2900 - (301) 423-2996 | 64 |
US Phone Directory: (301) 423-2***
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