Michigan Compiled Laws, Chapter 47. County Auditors § 47.130

Sec. 30. The supervisors in the county of Wayne shall hold their annual meeting in each year, at the time and place appointed by law; and shall have and exercise all the powers conferred by law upon the supervisors of the several counties, in relation to the equalizing and correcting of the assessments in said county, apportioning the state and county taxes to be collected in the several townships, ascertaining and returning the aggregate valuation of real and personal property in the county, and all other matters connected with the assessment and collection of taxes within said county.