| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 991-70** | (301) 991-7001 - (301) 991-7099 | 27 |
| (301) 991-71** | (301) 991-7100 - (301) 991-7199 | 34 |
| (301) 991-72** | (301) 991-7205 - (301) 991-7292 | 27 |
| (301) 991-73** | (301) 991-7301 - (301) 991-7399 | 35 |
| (301) 991-74** | (301) 991-7401 - (301) 991-7493 | 27 |
| (301) 991-75** | (301) 991-7501 - (301) 991-7599 | 24 |
| (301) 991-76** | (301) 991-7605 - (301) 991-7699 | 30 |
| (301) 991-77** | (301) 991-7700 - (301) 991-7799 | 36 |
| (301) 991-78** | (301) 991-7800 - (301) 991-7898 | 34 |
| (301) 991-79** | (301) 991-7900 - (301) 991-7999 | 26 |
US Phone Directory: (301) 991-7***
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