Mich. Comp. Laws § 45.41
Deputies of county officers in counties over 50,000; appointment, duties.
In all counties of this state having a population of more than 50,000 where it is provided by law that the county treasurer, county clerk and register of deeds shall receive salaries in lieu of fees, each of said officers may appoint a deputy or deputies who may perform all the official acts which the officer making su…