How many presidents have there been in the United States?

As of 2015, there have been 44 presidents of the United States. As Grover Cleveland held the office in two non-sequential terms, only 43 unique persons have held the position of president.

The first president of the United States was George Washington; Washington served in office from 1789 to 1797. Of the men who have served as president, 21 of them won re-election, including 13 who served two full terms. Four men assumed the office from their predecessor and later won election to a full term on their own right. Four presidents were assassinated while in office, while six presidents survived assassination attempts. Additionally, four other presidents died of illness while in office.