| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 452-40** | (301) 452-4000 - (301) 452-4096 | 41 |
| (301) 452-41** | (301) 452-4100 - (301) 452-4199 | 42 |
| (301) 452-42** | (301) 452-4200 - (301) 452-4299 | 36 |
| (301) 452-43** | (301) 452-4300 - (301) 452-4398 | 32 |
| (301) 452-44** | (301) 452-4400 - (301) 452-4499 | 38 |
| (301) 452-45** | (301) 452-4500 - (301) 452-4594 | 41 |
| (301) 452-46** | (301) 452-4601 - (301) 452-4699 | 36 |
| (301) 452-47** | (301) 452-4700 - (301) 452-4799 | 39 |
| (301) 452-48** | (301) 452-4803 - (301) 452-4899 | 31 |
| (301) 452-49** | (301) 452-4900 - (301) 452-4995 | 35 |
US Phone Directory: (301) 452-4***
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