Events from the year 1840 in the United States.
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- January 13–14 – The steamship Lexington burns and sinks in icy waters, 4 miles off the coast of Long Island; 139 die, only 4 survive.
- January 19 – Captain Charles Wilkes circumnavigates Antarctica, claiming what becomes known as Wilkes Land for the United States.
- March 4 – Alexander S. Wolcott and John Johnson open their "Daguerreian Parlor" on Broadway (Manhattan), the world's first commercial photography portrait studio.
- March 9 – The Wilmington and Raleigh Railroad is completed from Wilmington, North Carolina to Weldon, North Carolina. At 161.5 miles, it was the world's longest railroad at the time.[1]
- April – The Raleigh and Gaston Railroad is completed from Raleigh, North Carolina to near Weldon, North Carolina.[2]
- May 7 – The Great Natchez Tornado: A massive tornado strikes Natchez, Mississippi during the early afternoon hours. Before it is over, 317 people are killed and 109 injured. It is the second deadliest tornado in U.S. history.
- November 7 – U.S. presidential election, 1840: William Henry Harrison defeats Martin Van Buren.
- January 1 – Patrick Walsh, Irish-born U.S. Senator from Georgia from 1894 to 1895 (died 1899)
- January 29 – Henry H. Rogers, financier (died 1909)
- February 4 – Hiram Stevens Maxim, firearms inventor (died 1916)
- February 9 – William T. Sampson, U.S. Navy admiral (died 1902)
- March 5 – Constance Fenimore Woolson, fiction writer and poet (died 1894)
- April 28 – Caroline Shawk Brooks, sculptor (died 1913)
- May 1 – Cynthia S. Burnett, educator, temperance reformer, and newspaper editor (died 1932)
- May 4 – George Gray, U.S. Senator from Delaware from 1885 to 1899 (died 1925)
- June 3 – Michael O'Laughlen, conspirator in the assassination of Abraham Lincoln in 1865 (died 1867)
- June 6 – William Dudley Chipley, railroad tycoon and statesman (died 1897)
- June 14 – William F. Nast, attaché, railroad executive and inventor (died 1893)
- June 27 – Alpheus Beede Stickney, railroad executive (died 1916)
- July 10 – Esther G. Frame, Quaker minister and evangelist (died 1920)
- July 21 – Christian Abraham Fleetwood, Union Army 4th Colored Infantry Regiment soldier and Medal of Honor recipient (died 1914)
- August 25 – George C. Magoun, railroad executive (died 1893)
- August 28 – Ira D. Sankey, gospel singer and composer (died 1908)
- September 10 – William B. Avery, Union Army soldier and Medal of Honor recipient (died 1894)
- September 22 – Philip G. Shadrach, Union Army soldier and Medal of Honor recipient (died 1862)
- September 22 – D. M. Canright, Seventh-day Adventist minister and author, later one of the church's severest critics (died 1919)
- September 27 – Alfred Thayer Mahan, U.S. Navy admiral, geostrategist and historian (died 1914)
- September 23 – Simon B. Conover, U.S. Senator from Florida from 1873 to 1879 (died 1908)
- October 1 – Anthony Higgins, U.S. Senator from Delaware from 1889 to 1895 (died 1912)
- October 24 – Eliza Pollock, archer (died 1919)
- November 24 – John Brashear, astronomer (died 1920)
- Earliest probable date – Crazy Horse (Tȟašúŋke Witkó), Chief of the Oglala Lakota (killed 1877)