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.
Kentucky forms most of the northern border of Tennessee.
New Mexico''s northern border is shared with Colorado.
New York touches the northern border of Pennsylvania.
The State of Montana is bordered on the East by North Dakota and South Dakota, to the South by Wyoming, and to the West and South by Idaho. The Northern border of Montana is also the U.S./Canadian border (Canadian Provinces of Alberta and Saskatchewan).