List of presidents of the United States

The president of the United States is the head of state and head of government of the United States, indirectly elected to a four-year term via the Electoral College. Under the U.S. Constitution, the officeholder leads the executive branch of the federal government and is the commander-in-chief of the United States Armed Forces.

The first president, George Washington, won a unanimous vote of the Electoral College. The incumbent president is Donald Trump, who assumed office on January 20, 2025. Since the office was established in 1789, 45 men have served in 47 presidencies. The discrepancy is due to the nonconsecutive terms of Grover Cleveland (counted as the 22nd and 24th president) and Trump (counted as the 45th and 47th president).

The presidency of William Henry Harrison, who died 31 days after taking office in 1841, was the shortest in American history. Franklin D. Roosevelt served the longest, over twelve years, before dying early in his fourth term in 1945. He is the only U.S. president to have served more than two terms. Since the ratification of the Twenty-second Amendment to the United States Constitution in 1951, no person may be elected president more than twice, and no one who has served more than two years of a term to which someone else was elected may be elected more than once.

Four presidents died in office of natural causes (William Henry Harrison, Zachary Taylor, Warren G. Harding, and Franklin D. Roosevelt), four were assassinated (Abraham Lincoln, James A. Garfield, William McKinley, and John F. Kennedy), and one resigned (Richard Nixon, facing impeachment and removal from office). John Tyler was the first vice president to assume the presidency during a presidential term, setting the precedent that a vice president who does so becomes the fully functioning president with a new, distinct administration.

Throughout most of its history, American politics has been dominated by political parties. The Constitution is silent on the issue of political parties, and at the time it came into force in 1789, no organized parties existed. Soon after the 1st Congress convened, political factions began rallying around dominant Washington administration officials, such as Alexander Hamilton and Thomas Jefferson. Concerned about the capacity of political parties to destroy the fragile unity holding the nation together, Washington remained unaffiliated with any political faction or party throughout his eight-year presidency. He remains the only U.S. president who never affiliated with a political party.