| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 350-40** | (301) 350-4000 - (301) 350-4099 | 73 |
| (301) 350-41** | (301) 350-4108 - (301) 350-4199 | 62 |
| (301) 350-42** | (301) 350-4200 - (301) 350-4299 | 63 |
| (301) 350-43** | (301) 350-4300 - (301) 350-4399 | 72 |
| (301) 350-44** | (301) 350-4400 - (301) 350-4499 | 67 |
| (301) 350-45** | (301) 350-4500 - (301) 350-4599 | 62 |
| (301) 350-46** | (301) 350-4600 - (301) 350-4699 | 73 |
| (301) 350-47** | (301) 350-4700 - (301) 350-4797 | 66 |
| (301) 350-48** | (301) 350-4800 - (301) 350-4899 | 64 |
| (301) 350-49** | (301) 350-4900 - (301) 350-4998 | 67 |
US Phone Directory: (301) 350-4***
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