In Pictures: Tallest U.S. Presidents in History

United States presidents have grown taller over time, but who stands tallest among the commanders-in-chief? 

There is some evidence suggesting that the American public is more likely to vote for the taller of two main presidential candidates. In the 28 elections between 1900 and 2011, the taller candidate has won 18 times, while the shorter has won just eight (in two elections, the candidates were the same height). On average, the winner was one inch taller than his opponent. Source. 

In this gallery, we look at the 20 tallest U.S. presidents in history (there are actually 22, because there's a three-way tie for 20th position).