Alaska, as it shares a border with Canada that extends for about 1,538 miles.
California has the longest border with Nevada.
Miami is a city in the state of Florida in the US. There is no "border" with Miami and another nation.
Kentucky has the longest border with Tennessee.
Sacramento, California is the capital of the state that has the longest border on the Pacific Ocean
In the west, the state of Montana has the longest linear border with Canada. In the east, the state of Michigan has the longest border, including the Great Lakes.
Florida has the longest coastline border on the Gulf of Mexico with 770 miles. In Mexico, the state of Veracruz has the longest border with the Gulf of Mexico with 463 miles.
Illinois has the longest common border with Missouri.
Texas
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California shares the longest border with Nevada. The capital of California is Sacramento.
No state has both. Alaska has the longest State Border with Canada. Florida has the longest Atlantic shoreline.