| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 638-70** | (301) 638-7001 - (301) 638-7099 | 62 |
| (301) 638-71** | (301) 638-7101 - (301) 638-7198 | 62 |
| (301) 638-72** | (301) 638-7200 - (301) 638-7299 | 72 |
| (301) 638-73** | (301) 638-7300 - (301) 638-7399 | 59 |
| (301) 638-74** | (301) 638-7402 - (301) 638-7498 | 68 |
| (301) 638-75** | (301) 638-7500 - (301) 638-7599 | 62 |
| (301) 638-76** | (301) 638-7600 - (301) 638-7699 | 36 |
| (301) 638-77** | (301) 638-7700 - (301) 638-7799 | 80 |
| (301) 638-78** | (301) 638-7800 - (301) 638-7898 | 66 |
| (301) 638-79** | (301) 638-7900 - (301) 638-7999 | 61 |
US Phone Directory: (301) 638-7***
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