14. Millard Fillmore – 149
In 1850, Millard Fillmore assumed the presidency as the 13th president after the untimely death of his predecessor, Zachary Taylor, while in office. As a member of the Whig party, Fillmore holds the distinction of being the last president to hold office without being affiliated with either the Democratic or Republican parties. Fillmore’s early education was reportedly challenging, but his remarkable intelligence shone through. Despite the difficulties he faced, Fillmore showcased his high IQ by successfully gaining admission to the bar in 1823, signaling the beginning of his legal career.