| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 605-70** | (301) 605-7000 - (301) 605-7099 | 85 |
| (301) 605-71** | (301) 605-7100 - (301) 605-7199 | 90 |
| (301) 605-72** | (301) 605-7200 - (301) 605-7299 | 95 |
| (301) 605-73** | (301) 605-7300 - (301) 605-7399 | 82 |
| (301) 605-74** | (301) 605-7402 - (301) 605-7499 | 89 |
| (301) 605-75** | (301) 605-7500 - (301) 605-7597 | 88 |
| (301) 605-76** | (301) 605-7603 - (301) 605-7699 | 71 |
| (301) 605-77** | (301) 605-7700 - (301) 605-7799 | 79 |
| (301) 605-78** | (301) 605-7800 - (301) 605-7899 | 79 |
| (301) 605-79** | (301) 605-7900 - (301) 605-7999 | 78 |
US Phone Directory: (301) 605-7***
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