A sorted list of how many people remember each president, here. Remember, the order among the same numerical value is arbitrary because of how I sorted (Washington = Bush = Clinton), it doesn't mean that I dropped any significant digits. It means reverse alphabetical by first name. Also, presidents with the same name are equivalent because if you "remember" LBJ you also "remember" Andrew Johnson.

96% George Washington
96% George W. Bush
96% George H. W. Bush
96% Bill Clinton
95% John F. Kennedy
95% Abraham Lincoln
94% Ronald Reagan
94% Richard Nixon
93% Theodore Roosevelt
93% Franklin D. Roosevelt
91% Thomas Jefferson
91% John Quincy Adams
91% John Adams
91% Jimmy Carter
89% Lyndon B. Johnson
89% Andrew Johnson
88% Gerald Ford
84% Dwight D. Eisenhower
83% Andrew Jackson
80% Harry S. Truman
77% William H. Taft
77% Herbert Hoover
76% Ulysses S. Grant
74% James Madison
70% Woodrow Wilson
68% James Monroe
66% William H. Harrison
66% Benjamin Harrison
65% Grover Cleveland
65% Grover Cleveland
64% James Garfield
63% James K. Polk
62% Calvin Coolidge
60% William McKinley
59% Warren G. Harding
55% Zachary Taylor
55% John Tyler
53% Martin Van Buren
52% Millard Fillmore
51% James Buchanan
50% Rutherford B. Hayes
50% Franklin Pierce
49% Chester A. Arthur

Very few surprises here. A few thoughts.

1. I'm disappointed that Wilson's legacy has fallen below Grant and Taft. Even Hoover! (Hoover, to his credit, had a Dam.) I've heard a fair amount of Wilson-hate lately that I just can't really explain. That's an entry for later. It is, in the small of it, people who either look at too small a picture or too big a picture.

2. Garfield above Polk? Someone should really start a Polk appreciation society. I guess it's true what they say about one-termers. Pity, though, because Polk promised a lot, accomplished it all, and then elected to retire after four years. He's the closest thing the American public has to a Cincinnatus, and it's a shame that he's not as fondly remembered.

3. Abbreviated Presidents who are more famous than their successors:
Kennedy > Johnson, Lincoln > Johnson, Roosevelt > Truman, Garfield > Arthur, Harrison > Tyler, Nixon > Ford, Taylor > Fillmore
Accidental presidents more famous than their predecessors
Roosevelt > McKinley, Coolidge > Harding

4. While I'm glad to see him up there, I doubt anyone could tell you much more about Jackson than "he is on the $20." Another president who needs an information campaign. There's got to be something better than currency we can work with.