1. Presidents are numbered according to uninterrupted periods served by the same person. For example, George Washington served two consecutive terms and is counted as the first president, instead of the first and second, but Grover Cleveland and Donald Trump are counted twice because their two terms were not consecutive. A vice president who temporarily becomes acting president under the Twenty-fifth Amendment to the Constitution is not counted, because the president remains in office during such a period.
  2. Reflects the president's political party at the start of their presidency. Changes during their time in office are noted. Also reflects the vice president's political party unless otherwise noted beside the individual's name.
  3. Political parties had not been anticipated when the Constitution was drafted, nor did they exist at the time of the first presidential election in 1788–89. When they did develop, during Washington's first term, Adams joined the faction that became the Federalist Party. The elections of 1792 were the first ones in the United States that were contested on anything resembling a partisan basis.[5]
  4. The 1796 presidential election was the first contested American presidential election and the only one in which a president and vice president were elected from opposing political parties. Federalist John Adams was elected president, and Jefferson of the Democratic-Republicans was elected vice president.[7]
  5. 1 2 3 4 5 6 Died in office[10]
  6. Early during John Quincy Adams' term, the Democratic-Republican Party dissolved; his allies in Congress and at the state level were referred to as "Adams' Men" during the Adams presidency. When Andrew Jackson became president in 1829, this group became the "Anti-Jackson" opposition, and organized themselves as the National Republican Party.[13]
  7. John Calhoun, formerly a Democratic-Republican, founded the Nullifier Party in 1828 to oppose the Tariff of 1828 and advance the cause of states' rights, but was brought on as Andrew Jackson's running mate in the 1828 presidential election in an effort to broaden the democratic coalition led by Jackson.[14]
  8. Resigned from office[10]
  9. Millard Fillmore succeeded to the presidency upon the death of Zachary Taylor.[20]
  10. Millard Fillmore succeeded to the presidency upon the death of Marcy.[24]
  11. Cite error: The named reference powdered was invoked but never defined (see the help page).
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  18. Cite error: The named reference powdered10 was invoked but never defined (see the help page).
  19. Cite error: The named reference powdered9 was invoked but never defined (see the help page).
Cite error: There are <ref group=lower-alpha> tags or {{efn}} templates on this page, but the references will not show without a {{reflist|group=lower-alpha}} template or {{notelist}} template (see the help page).
  1. LOC; whitehouse.gov.
  2. Guide to U.S. Elections (2010), pp. 257–258.
  3. LOC.
  4. McDonald (2000).
  5. Guide to U.S. Elections (2010), pp. 197, 272; Nardulli (1992), p. 179.
  6. Pencak (2000).
  7. Guide to U.S. Elections (2010), p. 274.
  8. Peterson (2000).
  9. Banning (2000).
  10. 1 2 Neale (2004), p. 22.
  11. Ammon (2000).
  12. Hargreaves (2000).
  13. Guide to U.S. Elections (2010), p. 228; Goldman (1951), p. 159.
  14. Guide to U.S. Elections (2010), p. 892; Houpt (2010), pp. 26, 280.
  15. Remini (2000).
  16. Cole (2000).
  17. Pencak (2001).
  18. Pencak (2002).
  19. Pencak (2003).
  20. Abbott (2005), p. 639.
  21. 1 2 Smith (2000).
  22. Pencak (1999).
  23. Pencak (2009).
  24. Abbott (2015), p. 639.
  25. McPherson (b) (2000).
  26. McPherson (b) (1992).
  27. Remini (2010).
  28. Ammon (2021).
  29. McPherson (a) (2000).
  30. Ammon (2023).
  31. McPherson (a) (1997).
  32. Gould (a) (2000).
  33. McPherson (a) (2002).
  34. McPherson (a) (2005).
  35. Harbaugh (2000).
  36. Ambrosius (2000).
  37. Ambrosius (2021).
  38. McPherson (a) (2012).