Which presidents served for only one year?

There have been 23 (out of 42) Past Presidents that served one term or less.Presidents that served exactly one complete 4-year term:

• John Adams (1797-1801)
• John Quincy Adams (1825-19290
• Martin Van Buren (1837-1841)
• James Knox Polk ( 1845-1849)
• Rutherford B. Hayes (1877-1881)
• William Howard Taft (1909-1913)
• Herbert Hoover (1929-1933)
• Jimmy Carter (1977-1981)
• George H. W. Bush (1989-1993)

• John Tyler served 1,430 days as President after William Harrison's death.
• Andrew Johnson served 1,419 days after Lincoln's death.
• Chester Arthur served 1,216 days after Garfield's death.
• John Kennedy served 1,036 days before his death.
• Millard Fillmore served 969 days after Taylor's death.
• Gerald Ford served 895 days after Nixon's resignation.
• Warren Harding served 881 days before his death.
• Zachary Taylor served 491 days before his death.
• James Garfield served 199 days before his death.
• William Henry Harrison only served 31 days before his death.