| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 237-20** | (301) 237-2012 - (301) 237-2099 | 8 |
| (301) 237-21** | (301) 237-2101 - (301) 237-2198 | 12 |
| (301) 237-22** | (301) 237-2211 - (301) 237-2288 | 13 |
| (301) 237-23** | (301) 237-2319 - (301) 237-2398 | 7 |
| (301) 237-24** | (301) 237-2400 - (301) 237-2498 | 5 |
| (301) 237-25** | (301) 237-2503 - (301) 237-2598 | 10 |
| (301) 237-26** | (301) 237-2610 - (301) 237-2698 | 7 |
| (301) 237-27** | (301) 237-2716 - (301) 237-2795 | 11 |
| (301) 237-28** | (301) 237-2804 - (301) 237-2888 | 8 |
| (301) 237-29** | (301) 237-2920 - (301) 237-2957 | 4 |
US Phone Directory: (301) 237-2***
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