| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 292-50** | (301) 292-5000 - (301) 292-5099 | 65 |
| (301) 292-51** | (301) 292-5100 - (301) 292-5199 | 61 |
| (301) 292-52** | (301) 292-5200 - (301) 292-5299 | 67 |
| (301) 292-53** | (301) 292-5300 - (301) 292-5399 | 69 |
| (301) 292-54** | (301) 292-5401 - (301) 292-5499 | 68 |
| (301) 292-55** | (301) 292-5500 - (301) 292-5599 | 77 |
| (301) 292-56** | (301) 292-5600 - (301) 292-5698 | 73 |
| (301) 292-57** | (301) 292-5700 - (301) 292-5799 | 70 |
| (301) 292-58** | (301) 292-5800 - (301) 292-5898 | 73 |
| (301) 292-59** | (301) 292-5900 - (301) 292-5999 | 79 |
US Phone Directory: (301) 292-5***
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