| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 317-40** | (301) 317-4000 - (301) 317-4099 | 73 |
| (301) 317-41** | (301) 317-4100 - (301) 317-4199 | 70 |
| (301) 317-42** | (301) 317-4200 - (301) 317-4294 | 71 |
| (301) 317-43** | (301) 317-4300 - (301) 317-4399 | 77 |
| (301) 317-44** | (301) 317-4400 - (301) 317-4498 | 76 |
| (301) 317-45** | (301) 317-4500 - (301) 317-4598 | 69 |
| (301) 317-46** | (301) 317-4600 - (301) 317-4699 | 77 |
| (301) 317-47** | (301) 317-4700 - (301) 317-4799 | 77 |
| (301) 317-48** | (301) 317-4800 - (301) 317-4899 | 75 |
| (301) 317-49** | (301) 317-4900 - (301) 317-4999 | 65 |
US Phone Directory: (301) 317-4***
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