0 WHO IS THE TALLEST PRESIDENT?

Actually, there are two!

and

The tallest U.S. Presidents were Abraham Lincoln and Lyndon B. Johnson, both standing tall at a height of 6 ft 4 in (193 cm)!

Barack Obama is 6 ft 1 in (185 cm), and Joe Biden, the Vice-President, is 6 ft 0 in (183 cm).

Resource:  wikipedia