James Monroe – 138.6
James Monroe served as President from 1817 to 1825. He was a popular candidate for the position, and he easily won the election. His time in office was later dubbed the “Era of Good Feelings”. Monroe fought during the American Revolutionary War and is known for his foreign policy, “The Monroe Doctrine.” Monroe barely beat George W. Bush for the third-lowest IQ score, with a score of 138.6. Still, a score of 138.6 isn’t bad. According to the Wechsler IQ categorization, it is considered “very superior” intelligence.