Mich. Comp. Laws § 600.810a

Sec. 810a. (1) The probate judges in the counties of Arenac, Kalkaska, Crawford, Lake, Iron, and Ontonagon have the jurisdiction, powers, duties, and title of a district judge within their respective counties, in addition to the jurisdiction, powers, duties, and title of a probate judge. (2) Beginning January 2, 2007, in addition to the probate judges described in subsection (1), the probate judges in the counties of Alcona, Baraga, Benzie, Missaukee, Montmorency, Oscoda, and Presque Isle have the jurisdiction, powers, duties, and title of a district judge within their respective counties, in addition to the jurisdiction, powers, duties, and title of a probate judge. (3) In counties where the only district judgeship is being eliminated and the section in chapter 81 that governs that district court district provides that this section applies, the probate judge in that county shall have the jurisdiction, powers, duties, and title of a district judge within that county, in addition to the jurisdiction, powers, duties, and title of a probate judge.