| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 515-40** | (301) 515-4000 - (301) 515-4099 | 85 |
| (301) 515-41** | (301) 515-4100 - (301) 515-4199 | 79 |
| (301) 515-42** | (301) 515-4200 - (301) 515-4299 | 81 |
| (301) 515-43** | (301) 515-4300 - (301) 515-4399 | 77 |
| (301) 515-44** | (301) 515-4400 - (301) 515-4499 | 80 |
| (301) 515-45** | (301) 515-4500 - (301) 515-4599 | 78 |
| (301) 515-46** | (301) 515-4601 - (301) 515-4699 | 85 |
| (301) 515-47** | (301) 515-4700 - (301) 515-4799 | 80 |
| (301) 515-48** | (301) 515-4801 - (301) 515-4898 | 81 |
| (301) 515-49** | (301) 515-4902 - (301) 515-4999 | 75 |
US Phone Directory: (301) 515-4***
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