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
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
Alaska is the northernmost state of the U. S. Its northernmost point is along 71° 2' to 71° 5' north latitude.