1. Washington-11 (George Washington) has 2913 unique ancestors and 9057 duplicate ancestors (additional lines of descent from a unique ancestor) within 18 generations
At 19 generations: The ancestor data is too large to be stored. Therefore, if you use a link in the ancestor list to view an ancestral line and return to this page, you will need to generate the ancestor list again if you wish to see it. If you want to make the ancestor data small enough to be stored, try going back fewer generations.
2. Adams-10 (John Adams) has 141 ancestors within 20 generations
3. Jefferson-1 (Thomas Jefferson) has 3364 unique ancestors and 16042 duplicate ancestors (additional lines of descent from a unique ancestor) within 20 generations
4. Madison-1 (James Madison Jr.) has 3121 unique ancestors and 8331 duplicate ancestors (additional lines of descent from a unique ancestor) within 20 generations
5. Monroe-17 (James Monroe) has 16 ancestors within 20 generations
6. Adams-12 (John Quincy Adams) has 1843 unique ancestors and 1599 duplicate ancestors (additional lines of descent from a unique ancestor) within 20 generations
7. Jackson-1115 (Andrew Jackson) has 5 ancestors within 20 generations
8. Van_Buren-1 (Martin Van Buren Sr.) has 76 unique ancestors and 9 duplicate ancestors (additional lines of descent from a unique ancestor) within 20 generations
9. Harrison-912 (William Harrison) has 3421 unique ancestors and 10684 duplicate ancestors (additional lines of descent from a unique ancestor) within 20 generations
10. Tyler-150 (John Tyler) has 847 unique ancestors and 263 duplicate ancestors (additional lines of descent from a unique ancestor) within 20 generations