Adventures of Huckleberry Finn was first published in the United States in 1885.
Mark Twain’s novel appeared earlier in Canada and the United Kingdom, where it was published on December 10, 1884. The American edition followed on February 18, 1885, making 1885 the correct year for a question specifically asking about publication in the United States.
The book was issued by Charles L. Webster and Company, Twain’s own publishing firm, and featured illustrations by E. W. Kemble. Publication was delayed after an obscene alteration was discovered in one of the illustrations, requiring a replacement printing plate.
A common mix-up is answering 1884, which is correct for the first British and Canadian editions but not the American edition. Twain had worked on the manuscript intermittently from 1876 to 1883. The novel became one of the defining works of American literature, particularly for its use of regional speech and its satirical treatment of racism and slavery-era society.