| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 345-70** | (301) 345-7000 - (301) 345-7098 | 57 |
| (301) 345-71** | (301) 345-7100 - (301) 345-7199 | 66 |
| (301) 345-72** | (301) 345-7200 - (301) 345-7299 | 60 |
| (301) 345-73** | (301) 345-7305 - (301) 345-7399 | 56 |
| (301) 345-74** | (301) 345-7400 - (301) 345-7499 | 65 |
| (301) 345-75** | (301) 345-7500 - (301) 345-7599 | 57 |
| (301) 345-76** | (301) 345-7600 - (301) 345-7699 | 75 |
| (301) 345-77** | (301) 345-7700 - (301) 345-7799 | 68 |
| (301) 345-78** | (301) 345-7803 - (301) 345-7899 | 65 |
| (301) 345-79** | (301) 345-7900 - (301) 345-7998 | 65 |
US Phone Directory: (301) 345-7***
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