1904 in the United States
Events from the year 1904 in the United States.
- President: Theodore Roosevelt (R-New York)
- Vice President: vacant
- Chief Justice: Melville Fuller (Illinois)
- Speaker of the House of Representatives: Joseph Gurney Cannon (R–Illinois)
- Congress: 58th
- January 12 – Henry Ford sets a new automobile land speed record of 91.37 mph.
- January 16 – The first large-scale bodybuilding competition in America takes place at Madison Square Garden in New York City.
- February 7 – The Great Baltimore Fire in Baltimore, Maryland destroys over 1,500 buildings in 30 hours.
- February 23 – For $10 million, the United States gains control of the Panama Canal Zone.
- April 8 – Longacre Square in Midtown Manhattan is renamed Times Square after The New York Times.
- April 30 – The Louisiana Purchase Exposition World's Fair opens in St. Louis, Missouri (closes December 1).
- May 4 – U.S. Army engineers begin work on The Panama Canal.
- May 5 – Pitching against the Philadelphia Athletics, Cy Young of the Boston Americans throws the first perfect game in the modern era of baseball.
- May 30 – Alpha Gamma Delta women's fraternity is founded at Syracuse University in Syracuse, New York.
- June 15 – A fire aboard the steamboat General Slocum in New York City's East River kills 1,021.
- July 1 – The third Modern Olympic Games opens in St. Louis, Missouri, United States as part of the World's Fair.
- July 23 – In St. Louis, Missouri, the ice cream cone is invented during the Louisiana Purchase Exposition.
- September – Stuyvesant High School opens in New York City as Manhattan's first manual trade school for boys.
- September 25 – The Church of Jesus Christ of Latter-day Saints President Joseph F. Smith issues a Second Manifesto against polygamy.
- October – The Daytona Educational and Industrial Training School for Negro Girls, predecessor of Bethune–Cookman University, is opened in Florida by Mary McLeod Bethune.
- October 1 – Phi Delta Epsilon, the international medical fraternity, is founded by Aaron Brown and eight of his friends at Cornell University Medical College.
- October 5 – Alpha Kappa Psi, the co-ed Professional Business Fraternity, is founded on the campus of New York University
- October 15 – Theta Tau, the Professional Engineering Fraternity, is founded at the University of Minnesota in Minneapolis, Minnesota.
- October 17 – Amadeo Giannini founds the Bank of Italy in San Francisco, predecessor of the Bank of America.
- October 19 – Polytechnic University of the Philippines is founded as Manila Business School through the superintendence of the American Gabriel A. O’Reilly.
- October 27 – The first underground line of the New York City Subway opens.
- November 8 – U.S. presidential election, 1904: Republican incumbent Theodore Roosevelt defeats Democrat Alton B. Parker.
- December 10 – The Pi Kappa Phi Fraternity is founded at the College of Charleston in South Carolina.
- December 30 – The East Boston Tunnel opens.
- December 31 – In New York City, the first New Year's Eve celebration is held in Times Square.
- St. Bernard's School is founded in New York City on Manhattan.
- January 5 – Jeane Dixon, astrologer (died 1997)
- January 10 – Ray Bolger, actor, singer and dancer, best known for his role in The Wizard of Oz (died 1987)
- January 19 – Leo Soileau, Cajun musician (died 1980)
- January 21 – Edris Rice-Wray Carson, medical researcher (died 1990)
- January 26 – Ancel Keys, nutritionist (died 2004)
- February 3 – Pretty Boy Floyd, bank robber (shot 1934)
- February 16 – George F. Kennan, political adviser (died 2005)
- March 1
- March 2 – Dr. Seuss, children's author (The Cat in the Hat) (died 1991)
- March 20
- March 23 (possible year) – Joan Crawford, actress (died 1977)
- March 26 – Joseph Campbell, author on mythology (died 1987)
- April 12 – Glen H. Taylor, U.S. Senator from Idaho from 1945 to 1951 (died 1984)
- April 18 – Pigmeat Markham, African American entertainer (died 1981)
- April 20 – Bob Bartlett, U.S. Senator from Alaska from 1959 to 1968 (died 1968)
- April 22 – J. Robert Oppenheimer, physicist (died 1967)
- May 17 – John J. Williams, U.S. Senator from Delaware from 1947 to 1970 (died 1988)
- May 21
- June 3 – Charles R. Drew, African American physician, pioneer in blood transfusion (died 1950)
- June 2 – Johnny Weissmuller, swimmer and actor (Tarzan) (died 1984)
- June 24 – Phil Harris, bandleader and comic actor (died 1995)
- July 1 – Mary Calderone, physician and public health advocate (died 1998)
- August 16– Wendell Meredith Stanley, chemist, recipient of the Nobel Prize in Chemistry in 1946 (died 1971)
- August 17 – Mary Cain, newspaper editor and politician (died 1984)
- August 21 – Count Basie, African American jazz bandleader (died 1984)
- September 12 – Lou Moore, race car driver and team owner (died 1956)
- October 3 – Charles J. Pedersen, chemist, recipient of the Nobel Prize in Chemistry in 1987 (died 1989)
- November 1 – Laura La Plante, silent film actress (died 1996)
- November 25 – Lillian Copeland, Olympic field athlete (died 1964)
- December 7 – Clarence Nash, voice actor (died 1985)
- December 18 – George Stevens, film director (died 1975)
- December 25 – Flemmie Pansy Kittrell, nutritionist (died 1980)
- December 30 – David M. Shoup, general (died 1983)
- January 2 – James Longstreet, one of the foremost Confederate generals of the American Civil War (born 1821)
- January 9 – John Brown Gordon, U.S. Senator from Georgia from 1873 to 1880 and from 1891 to 1897 (born 1832)
- January 20 – Maria Louisa Bustill, schoolteacher, mother of Paul Robeson (born 1853)
- February 15 – Mark Hanna, U.S. Senator from Ohio (born 1837)
- March 18 – William Elbridge Sewell, naval officer and Governor of Guam (born 1851)
- June 5 – Olivia Langdon Clemens, editor (born 1845)
- June 28 – Dan Emmett, founder of the Virginia Minstrels (born 1815)
- July 26 – Henry Clay Taylor, admiral (born 1845)
- August 16 – Colonel Prentiss Ingraham, author of dime fiction (born 1843)
- August 22 – Kate Chopin, fiction writer (born 1850)
- October 11 – Trumbull Stickney, classicist and poet (born 1874)
- December 21 – George L. Shoup, U.S. Senator from Idaho from 1890 to 1901 (born 1836)
- Little Joe Monahan, transgender rancher (born 1850)
- "Domestic Chronology", Statistician and Economist, San Francisco: Louis P. McCarty, 1905, pp. 227–347 – via HathiTrust. (Covers events May 1898-June 1905.)
- Media related to 1904 in the United States at Wikimedia Commons