| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 490-40** | (301) 490-4001 - (301) 490-4099 | 73 |
| (301) 490-41** | (301) 490-4101 - (301) 490-4199 | 84 |
| (301) 490-42** | (301) 490-4200 - (301) 490-4299 | 81 |
| (301) 490-43** | (301) 490-4300 - (301) 490-4399 | 72 |
| (301) 490-44** | (301) 490-4400 - (301) 490-4499 | 76 |
| (301) 490-45** | (301) 490-4500 - (301) 490-4599 | 81 |
| (301) 490-46** | (301) 490-4601 - (301) 490-4699 | 77 |
| (301) 490-47** | (301) 490-4700 - (301) 490-4799 | 75 |
| (301) 490-48** | (301) 490-4800 - (301) 490-4899 | 84 |
| (301) 490-49** | (301) 490-4900 - (301) 490-4999 | 86 |
US Phone Directory: (301) 490-4***
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