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The IQ of Benjamin Franklin is believed to be at about 160
160
This question is almost impossible to answer, because no one knows if he ever had an IQ test, and if he did the results are not known. He was however a very sharp man, with a quick mind and a tremendous memory. He was known to work 16+ hour days regularly.
IF (and oh, what a big if) every president of the USA had an average IQ in the era they lived in compered with every one else in that time, the most recent president is considered to be the one with the highest IQ and the first president the one with the lowest (George Washington). This is because mankind is getting smarter every new generation (statistically).
George Washington never took an IQ test; they had not yet been invented in his lifetime. The earliest test that we would recognize as an IQ test dates from the early 20th century. French psychologist Alfred Binet, together with psychologists Victor Henri and Théodore Simon, after about 15 years of development, published the Binet-Simon test in 1905, which focused on verbal abilities.