Which country is located north of the United States?

Canada is situated directly to the north of the United States, sharing the longest international land border in the world. This geographical positioning makes Canada the immediate neighbor to the north, where states such as Alaska (the northernmost state) are adjacent to Canadian provinces like Yukon and British Columbia.

The other options refer to countries that are either located to the south or across significant oceans from the United States. Mexico is situated to the south of the United States, while Russia, although partially north of the U.S., is separated by the Bering Strait and is not an immediate neighbor. Japan is located across the Pacific Ocean to the west of the United States. Therefore, Canada is the only country among the choices that lies directly north of the United States.