| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 278-50** | (301) 278-5000 - (301) 278-5096 | 77 |
| (301) 278-51** | (301) 278-5100 - (301) 278-5199 | 80 |
| (301) 278-52** | (301) 278-5200 - (301) 278-5299 | 75 |
| (301) 278-53** | (301) 278-5300 - (301) 278-5398 | 78 |
| (301) 278-54** | (301) 278-5400 - (301) 278-5499 | 77 |
| (301) 278-55** | (301) 278-5500 - (301) 278-5599 | 82 |
| (301) 278-56** | (301) 278-5600 - (301) 278-5699 | 77 |
| (301) 278-57** | (301) 278-5700 - (301) 278-5799 | 84 |
| (301) 278-58** | (301) 278-5802 - (301) 278-5898 | 76 |
| (301) 278-59** | (301) 278-5902 - (301) 278-5999 | 76 |
US Phone Directory: (301) 278-5***
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