400px|thumb|International border states are shown in red on this map. Florida shares a water border with Cuba and The Bahamas.|alt=The international border states are those states in the U.S. that border either the Bahamas, Canada, Cuba, Mexico, or Russia. With a total of eighteen of such states, thirteen (including Alaska) lie on the U.S.–Canada border, four lie on the U.S.–Mexico border, and one has maritime borders with Cuba and The Bahamas.

Border with Canada

Thirteen states lie on the U.S.–Canada border. The U.S. states of Indiana, Illinois, and Wisconsin do not share a direct geographic border with Canada. They do, however, possess customs facilities because they border the Great Lakes, on which international commerce comes from Canada. (All three states border Lake Michigan, while Wisconsin also borders Lake Superior.)

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! State !! Adjacent province<br/> or territory !! Length of border !! Description (if not land border)

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| Alaska || British Columbia and Yukon || 1,538&nbsp;mi (2,475&nbsp;km) ||

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| Michigan || Ontario || 721&nbsp;mi (1,160&nbsp;km) || Water boundary (land border on Crystal Island)

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| Maine || New Brunswick, Nova Scotia, and Quebec || 611&nbsp;mi (983&nbsp;km) || Water boundary with Nova Scotia

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| Minnesota || Manitoba and Ontario || 547&nbsp;mi (880&nbsp;km) || Water boundary with Ontario

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| Montana || Alberta, British Columbia, and Saskatchewan || 545&nbsp;mi (877&nbsp;km) ||

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| New York || Ontario and Quebec || 445&nbsp;mi (716&nbsp;km)|| Water and land boundary with Ontario

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| Washington || British Columbia || 427&nbsp;mi (687&nbsp;km) ||

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| North Dakota || Manitoba and Saskatchewan || 310&nbsp;mi (499&nbsp;km) ||

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| Ohio || Ontario || 146&nbsp;mi (235&nbsp;km) || On Lake Erie

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| Vermont || rowspan="2" | Quebec || 90&nbsp;mi (145&nbsp;km) ||

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| New Hampshire || 58&nbsp;mi (93&nbsp;km) ||

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| Idaho || British Columbia || 45&nbsp;mi (72&nbsp;km) ||

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| Pennsylvania || Ontario || 42&nbsp;mi (68&nbsp;km) || On Lake Erie

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Border with Mexico

Four states lie on the U.S.–Mexico border.

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! State !! Adjacent Mexican state !! Length of border