| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 237-40** | (301) 237-4014 - (301) 237-4098 | 10 |
| (301) 237-41** | (301) 237-4106 - (301) 237-4181 | 3 |
| (301) 237-42** | (301) 237-4217 - (301) 237-4255 | 3 |
| (301) 237-43** | (301) 237-4315 - (301) 237-4397 | 12 |
| (301) 237-44** | (301) 237-4409 - (301) 237-4499 | 6 |
| (301) 237-45** | (301) 237-4528 - (301) 237-4596 | 8 |
| (301) 237-46** | (301) 237-4605 - (301) 237-4681 | 6 |
| (301) 237-47** | (301) 237-4701 - (301) 237-4799 | 3 |
| (301) 237-48** | (301) 237-4803 - (301) 237-4892 | 7 |
| (301) 237-49** | (301) 237-4934 - (301) 237-4989 | 9 |
US Phone Directory: (301) 237-4***
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