Mich. Comp. Laws § 46.411
A candidate for the office of county commissioner must be a resident and registered voter of the district that he or she seeks to represent and must remain a resident and registered voter to hold his or her office, if elected. Nominations and elections for commissioners must be by partisan elections. In order for the name of a candidate for nomination for the office of county commissioner to appear on the official primary ballot, a nominating petition or a nonrefundable filing fee of $100.00 must be filed with the county clerk. The nominating petition must have been signed by a number of qualified and registered electors residing within the district as determined under section 544f of the Michigan election law, 1954 PA 116, MCL 168.544f. The deadline for filing nomination petitions or filing fees is the same as for a candidate for state representative. An individual who has been convicted of a violation of section 12a(1) of 1941 PA 370, MCL 38.412a, is not eligible to be a county commissioner for 20 years after the conviction.
MCL 46.411