| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 515-50** | (301) 515-5000 - (301) 515-5099 | 81 |
| (301) 515-51** | (301) 515-5100 - (301) 515-5199 | 86 |
| (301) 515-52** | (301) 515-5200 - (301) 515-5299 | 35 |
| (301) 515-53** | (301) 515-5300 - (301) 515-5398 | 76 |
| (301) 515-54** | (301) 515-5400 - (301) 515-5499 | 62 |
| (301) 515-55** | (301) 515-5500 - (301) 515-5598 | 84 |
| (301) 515-56** | (301) 515-5600 - (301) 515-5699 | 82 |
| (301) 515-57** | (301) 515-5700 - (301) 515-5799 | 78 |
| (301) 515-58** | (301) 515-5800 - (301) 515-5897 | 86 |
| (301) 515-59** | (301) 515-5900 - (301) 515-5999 | 80 |
US Phone Directory: (301) 515-5***
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