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| Birthday April 20, 1923 Mambo King Tito Puente is born |
| History April 20, 1689 Siege of Londonderry begins |
| History April 20, 1777 New York adopts state constitution |
| History April 20, 1841 First detective story is published |
| History April 20, 1861 Lee resigns from U.S. Army |
| History April 20, 1871 Ku Klux Act passed by Congress |
| History April 20, 1872 Bar Association of San Francisco organized. |
| History April 20, 1898 McKinley asks for declaration of war with Spain |
| History April 20, 1902 Curies isolate radium |
| History April 20, 1914 Militia slaughters strikers at Ludlow, Colorado |
| History April 20, 1917 Nivelle Offensive ends in failure |
| History April 20, 1926 New sound process for films announced |
| History April 20, 1945 Operation Corncob is launched while Hitler celebrates his birthday |
| History April 20, 1958 Buses replace Key System trains at 3AM. |
| History April 20, 1970 Nixon announces more troop withdrawals |
| History April 20, 1971 Fragging on the rise in U.S. units |
| History April 20, 1978 Korean Air Lines jet forced down over Soviet Union |
| History April 20, 1986 Jordan scores 63 points in playoff game |
| History April 20, 1999 Columbine High School massacre |
| History April 20, 1999 A massacre at Columbine High School |
| History April 20, 2008 Danica Patrick becomes first woman to win Indy race |
| History April 20, 2010 Massive oil spill begins in Gulf of Mexico |