| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 559-40** | (301) 559-4000 - (301) 559-4098 | 77 |
| (301) 559-41** | (301) 559-4101 - (301) 559-4198 | 72 |
| (301) 559-42** | (301) 559-4206 - (301) 559-4299 | 69 |
| (301) 559-43** | (301) 559-4302 - (301) 559-4399 | 68 |
| (301) 559-44** | (301) 559-4400 - (301) 559-4499 | 73 |
| (301) 559-45** | (301) 559-4502 - (301) 559-4599 | 75 |
| (301) 559-46** | (301) 559-4600 - (301) 559-4699 | 80 |
| (301) 559-47** | (301) 559-4700 - (301) 559-4799 | 70 |
| (301) 559-48** | (301) 559-4803 - (301) 559-4899 | 67 |
| (301) 559-49** | (301) 559-4900 - (301) 559-4999 | 72 |
US Phone Directory: (301) 559-4***
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