| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 657-40** | (301) 657-4000 - (301) 657-4099 | 57 |
| (301) 657-41** | (301) 657-4100 - (301) 657-4199 | 59 |
| (301) 657-42** | (301) 657-4200 - (301) 657-4298 | 52 |
| (301) 657-43** | (301) 657-4302 - (301) 657-4399 | 60 |
| (301) 657-44** | (301) 657-4406 - (301) 657-4499 | 54 |
| (301) 657-45** | (301) 657-4500 - (301) 657-4599 | 54 |
| (301) 657-46** | (301) 657-4600 - (301) 657-4699 | 54 |
| (301) 657-47** | (301) 657-4700 - (301) 657-4796 | 49 |
| (301) 657-48** | (301) 657-4800 - (301) 657-4874 | 18 |
| (301) 657-49** | (301) 657-4929 - (301) 657-4994 | 12 |
US Phone Directory: (301) 657-4***
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