The University of Michigan, Ann Arbor (U of M, U-M, UM or simply Michigan) is a public university in the state of Michigan. The university was started in 1817 in Detroit, about 20 years before Michigan became a state, and moved to Ann Arbor in 1837. It is the state's oldest university and the main campus; there are two other campuses—the University of Michigan-Flint and the University of Michigan–Dearborn.