| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 604-40** | (301) 604-4000 - (301) 604-4099 | 84 |
| (301) 604-41** | (301) 604-4100 - (301) 604-4199 | 84 |
| (301) 604-42** | (301) 604-4200 - (301) 604-4299 | 80 |
| (301) 604-43** | (301) 604-4337 - (301) 604-4366 | 5 |
| (301) 604-44** | (301) 604-4401 - (301) 604-4499 | 80 |
| (301) 604-45** | (301) 604-4552 - (301) 604-4571 | 2 |
| (301) 604-47** | (301) 604-4700 - (301) 604-4799 | 79 |
| (301) 604-48** | (301) 604-4800 - (301) 604-4899 | 76 |
| (301) 604-49** | (301) 604-4901 - (301) 604-4999 | 83 |
US Phone Directory: (301) 604-4***
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