| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 322-70** | (301) 322-7000 - (301) 322-7095 | 55 |
| (301) 322-71** | (301) 322-7100 - (301) 322-7199 | 57 |
| (301) 322-72** | (301) 322-7200 - (301) 322-7299 | 72 |
| (301) 322-73** | (301) 322-7300 - (301) 322-7399 | 69 |
| (301) 322-74** | (301) 322-7400 - (301) 322-7499 | 75 |
| (301) 322-75** | (301) 322-7500 - (301) 322-7598 | 71 |
| (301) 322-76** | (301) 322-7600 - (301) 322-7699 | 72 |
| (301) 322-77** | (301) 322-7700 - (301) 322-7797 | 54 |
| (301) 322-78** | (301) 322-7801 - (301) 322-7898 | 68 |
| (301) 322-79** | (301) 322-7900 - (301) 322-7999 | 71 |
US Phone Directory: (301) 322-7***
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