| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 439-40** | (301) 439-4003 - (301) 439-4099 | 75 |
| (301) 439-41** | (301) 439-4100 - (301) 439-4199 | 77 |
| (301) 439-42** | (301) 439-4202 - (301) 439-4299 | 79 |
| (301) 439-43** | (301) 439-4300 - (301) 439-4399 | 79 |
| (301) 439-44** | (301) 439-4400 - (301) 439-4496 | 77 |
| (301) 439-45** | (301) 439-4501 - (301) 439-4599 | 83 |
| (301) 439-46** | (301) 439-4600 - (301) 439-4699 | 85 |
| (301) 439-47** | (301) 439-4700 - (301) 439-4799 | 76 |
| (301) 439-48** | (301) 439-4800 - (301) 439-4899 | 73 |
| (301) 439-49** | (301) 439-4900 - (301) 439-4998 | 73 |
US Phone Directory: (301) 439-4***
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