Michigan was a region located in the United States of America on Earth's North American continent. It was the location of several of the Great Lakes and was a border state with Canada.
One major city in Michigan was Detroit. In 2004, Captain Jonathan Archer and Subcommander T'Pol were sent on a mission to Detroit by temporal agent Daniels. (ENT: "Carpenter Street")
Erika Hernandez, captain of the Columbia, was born in Detroit. (ENT: "Home")