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.
If you are refering to The united states; then the answer would be Alaska ; with point barrow being the northern most point
Queensland
The northernmost point in the United States is Point Barrow, Alaska.
Alabama
Rouse's Point, NY
The state with a little jog in its northern border that makes it the most northern is Alaska. This jog occurs at the Aleutian Islands, where some islands extend into the Eastern Hemisphere, making parts of Alaska farther north than the majority of Canada. As a result, Alaska is not only the northernmost state in the U.S. but also contains the northernmost point of land in North America, Point Barrow.
Indiana's most Northern point is Northern border with Illinois and Michigan
bob
The most northern point is the North Pole.
The motto of Northern State University is 'Be You Be Us Be Northern'.
California is a northern state.
Alaska is USA's most northern state