| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 299-40** | (301) 299-4000 - (301) 299-4099 | 77 |
| (301) 299-41** | (301) 299-4100 - (301) 299-4199 | 80 |
| (301) 299-42** | (301) 299-4200 - (301) 299-4297 | 76 |
| (301) 299-43** | (301) 299-4300 - (301) 299-4399 | 72 |
| (301) 299-44** | (301) 299-4400 - (301) 299-4499 | 75 |
| (301) 299-45** | (301) 299-4500 - (301) 299-4599 | 73 |
| (301) 299-46** | (301) 299-4600 - (301) 299-4699 | 70 |
| (301) 299-47** | (301) 299-4703 - (301) 299-4799 | 80 |
| (301) 299-48** | (301) 299-4800 - (301) 299-4899 | 71 |
| (301) 299-49** | (301) 299-4900 - (301) 299-4999 | 82 |
US Phone Directory: (301) 299-4***
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