Despite our history books, George logs in at number 17.
The following served as the President of the First Continental Congress:
1. Peyton Randolph (September 5, 1774 – October 21, 1774)
2. Henry Middleton (October 22, 1774 – October 26, 1774) 
The following served as the President of the Second Continental Congress:
3. Peyton Randolph (May 10, 1775 – May 23, 1775) 
4. John Hancock (May 24, 1775 – October 31, 1777) 
5. Henry Laurens (November 1, 1777 – December 9, 1778) 
6. John Jay (December 10, 1778 – September 27, 1779) 
7. Samuel Huntington (September 28, 1779 – March 1, 1781
Note: Samuel Huntington continued as president from the President of the Second Continental Congress to the President of the United States in Congress Assembled with only a title change.
The following served as President of the United States in Congress Assembled: (maximum one year terms)
7. Samuel Huntington (March 1, 1781 – July 9, 1781) 
8. Thomas McKean (July 10, 1781 – November 4, 1781)
Note: Thomas McKean was the first to use the title of President of the United States.
9. John Hanson (November 5, 1781 – November 3, 1782) 
10. Elias Boudinot (November 4, 1782 – November 2, 1783) 
11. Thomas Mifflin (November 3, 1783 – October 31, 1784) 
12. Richard Henry Lee (November 30, 1784 – November 6, 1785) 
13. John Hancock (November 23, 1785 – May 29, 1786) 
14. Nathaniel Gorham (June 6, 1786 – November 5, 1786) 
15. Arthur St. Clair (February 2, 1787 – November 4, 1787) 
16. Cyrus Griffin (January 22, 1788 – November 2, 1788) 
The following served as President of the United States under the current US Constitution:
17. George Washington, 1789-1797 
John Adams, 1797-1801 
Thomas Jefferson, 1801-1809 
James Madison, 1809-1817 
James Monroe, 1817-1825 
John Quincy Adams, 1825-1829 
Andrew Jackson, 1829-1837 
Martin Van Buren, 1837-1841 
William Henry Harrison, 1841 
John Tyler, 1841-1845 
James Knox Polk, 1845-1849 
Zachary Taylor, 1849-1850 
Millard Fillmore, 1850-1853 
Franklin Pierce, 1853-1857 
James Buchanan, 1857-1861 
Abraham Lincoln, 1861-1865 
Andrew Johnson, 1865-1869 
Ulysses Simpson Grant, 1869-1877 
Rutherford Birchard Hayes, 1877-1881 
James Abram Garfield, 1881 
Chester Alan Arthur, 1881-1885 
Grover Cleveland, 1885-1889 
Benjamin Harrison, 1889-1893 
Grover Cleveland, 1893-1897 
William McKinley, 1897-1901 
Theodore Roosevelt, 1901-1909 
William Howard Taft, 1909-1913 
Woodrow Wilson, 1913-1921 
Warren Gamaliel Harding, 1921-1923 
Calvin Coolidge, 1923-1929 
Herbert Clark Hoover, 1929-1933 
Franklin Delano Roosevelt, 1933-1945 
Harry S. Truman, 1945-1953 
Dwight David Eisenhower 1953-1961 
John Fitzgerald Kennedy, 1961-1963 
Lyndon Baines Johnson, 1963-1969 
Richard Milhous Nixon, 1969-1974 
Gerald Rudolph Ford, 1974-1977 
James Earl Carter, Jr., 1977-1981 
Ronald Wilson Reagan, 1981-1989 
George Herbert Walker Bush, 1989-1993 
William Jefferson Clinton, 1993-2001 
George Walker Bush, 2001-