| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 537-20** | (301) 537-2004 - (301) 537-2095 | 21 |
| (301) 537-21** | (301) 537-2100 - (301) 537-2190 | 23 |
| (301) 537-22** | (301) 537-2200 - (301) 537-2298 | 29 |
| (301) 537-23** | (301) 537-2307 - (301) 537-2396 | 17 |
| (301) 537-24** | (301) 537-2400 - (301) 537-2497 | 24 |
| (301) 537-25** | (301) 537-2501 - (301) 537-2597 | 26 |
| (301) 537-26** | (301) 537-2604 - (301) 537-2699 | 27 |
| (301) 537-27** | (301) 537-2704 - (301) 537-2799 | 25 |
| (301) 537-28** | (301) 537-2801 - (301) 537-2899 | 34 |
| (301) 537-29** | (301) 537-2900 - (301) 537-2993 | 25 |
US Phone Directory: (301) 537-2***
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