| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 420-40** | (301) 420-4000 - (301) 420-4099 | 74 |
| (301) 420-41** | (301) 420-4100 - (301) 420-4198 | 62 |
| (301) 420-42** | (301) 420-4200 - (301) 420-4299 | 64 |
| (301) 420-43** | (301) 420-4300 - (301) 420-4399 | 67 |
| (301) 420-44** | (301) 420-4400 - (301) 420-4499 | 55 |
| (301) 420-45** | (301) 420-4503 - (301) 420-4599 | 74 |
| (301) 420-46** | (301) 420-4600 - (301) 420-4698 | 58 |
| (301) 420-47** | (301) 420-4700 - (301) 420-4799 | 63 |
| (301) 420-48** | (301) 420-4800 - (301) 420-4899 | 61 |
| (301) 420-49** | (301) 420-4900 - (301) 420-4998 | 62 |
US Phone Directory: (301) 420-4***
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