| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 229-40** | (301) 229-4000 - (301) 229-4099 | 66 |
| (301) 229-41** | (301) 229-4100 - (301) 229-4199 | 74 |
| (301) 229-42** | (301) 229-4200 - (301) 229-4299 | 75 |
| (301) 229-43** | (301) 229-4300 - (301) 229-4399 | 75 |
| (301) 229-44** | (301) 229-4402 - (301) 229-4499 | 73 |
| (301) 229-45** | (301) 229-4501 - (301) 229-4599 | 74 |
| (301) 229-46** | (301) 229-4600 - (301) 229-4699 | 82 |
| (301) 229-47** | (301) 229-4700 - (301) 229-4799 | 72 |
| (301) 229-48** | (301) 229-4800 - (301) 229-4899 | 79 |
| (301) 229-49** | (301) 229-4900 - (301) 229-4999 | 75 |
US Phone Directory: (301) 229-4***
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