Who was the President of the United States in 1864?

Abraham Lincoln was the President of the United States in 1864. Abraham Lincoln (born February 12, 1809 in Hardin County, Kentucky; died April 15, 1865 in Washington DC) succeeded James Buchanan as the sixteenth President of the United States, serving between March 4, 1861 and his death on April 15, 1865, including the whole of the year 1864.