Mich. Comp. Laws § 600.541

Sec. 541. The fortieth judicial circuit consists of the counties of Lapeer and Tuscola and has 3 judges. If the county of Lapeer approves the reformation of the fortieth judicial circuit pursuant to law, and the county of Tuscola approves the creation of the fifty-fourth judicial circuit pursuant to law, the fortieth judicial circuit consists of the county of Lapeer and has 2 judges effective July 1, 1981.