51号美国国道（英语：U.S. Route 51）是一条南北方向的美国国道。该公路连接了路易斯安那州拉普拉斯和威斯康辛州艾昂县，全长1,286英里。
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| 道路信息 | |
| 管理方 | Kentucky Transportation Cabinet[*]、Louisiana Department of Transportation and Development[*]、密西西比州交通局[*]、Wisconsin Department of Transportation[*] |
| 道路总长 | 1,277英里（2,055公里） |
| 公路系统 | |
外部链接
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