Alaska
It is Alaska.
Washington State's northern border with Canada is a straight line from Blaine WA to its eastern border with Idaho. That northern border line is the most northern point.
Connecticut is north of New York's maritime border
Only one US state borders Alberta, Canada, that being Montana.
South Dakota shares its northern border with Nebraska.
Los Angeles to Alberta: 1,900 road milesLouisiana (LA) to Alberta: 2,264 (from the northern state line of Louisiana)
The state that shares a northern border with South Dakota is Nebraska. The capital of Nebraska is Lincoln.
New Mexico''s northern border is shared with Colorado.
New York touches the northern border of Pennsylvania.
Kentucky forms most of the northern border of Tennessee.
Nebraska.