Alexander Hamilton was born on January 11, in either 1755 or 1757, on the island of Nevis in the British West Indies.

Most modern references phrase it this way:

  • January 11 is agreed as the day of birth.
  • The exact year is disputed: some evidence points to 1755, while Hamilton himself often used 1757.

So if you need a concise line for “when was Alexander Hamilton born,” the best historically accurate answer is: January 11, 1755/1757 (disputed), Nevis, British West Indies.