A Canadian friend of mine lives in B.C. and told me that, "80% of Canadians live within x miles of the U.S. border.... We call it 'huddled up to the stove'".
it's within 200 miles. Also a different but fun fact - 80% of the canadian population lives in one straight line between Quebec City and Windsor Ontario (adjacent to Detroit), we call that l'axe Quebec-Windsor: https://en.wikipedia.org/wiki/Quebec_City–Windsor_Corridor
