| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 524-70** | (301) 524-7001 - (301) 524-7099 | 29 |
| (301) 524-71** | (301) 524-7100 - (301) 524-7193 | 30 |
| (301) 524-72** | (301) 524-7214 - (301) 524-7297 | 29 |
| (301) 524-73** | (301) 524-7300 - (301) 524-7399 | 32 |
| (301) 524-74** | (301) 524-7400 - (301) 524-7499 | 18 |
| (301) 524-75** | (301) 524-7500 - (301) 524-7597 | 22 |
| (301) 524-76** | (301) 524-7608 - (301) 524-7696 | 27 |
| (301) 524-77** | (301) 524-7702 - (301) 524-7797 | 31 |
| (301) 524-78** | (301) 524-7804 - (301) 524-7895 | 29 |
| (301) 524-79** | (301) 524-7903 - (301) 524-7999 | 31 |
US Phone Directory: (301) 524-7***
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