The number of certified interpreters in the state of Michigan has flucturated greatly over the years. In February of 2023, there were approximately 1,215 interpreters. In 2011, there were only 467!
One issue that Michigan deals with is area-specific shortages. For example, there are few interpreters in the UP and Northern Michigan. Most interpreters in the state seem to be clustered near Kalamazoo, Lansing, and Detroit. In Lansing there is a college (Lansing Community College) that produces a sizable number of ASL interpreters for the state. Detroit has a large concentration of Deaf adults. Notice there are large areas in northern Michigan and in the Upper Peninsula that have zero registered interpreters—these areas are served by interpreters traveling from other locations.
Interpreter information comes from the Division on Deafness, DeafBlind and Hard of Hearing (August 2015). Population information from US Census Bureau (2015)