Mich. Comp. Laws § 45.4: County property.

Sec. 4.

All real and personal estate, heretofore conveyed by any form of conveyance to the inhabitants of any county, or to the county treasurer, or the governor of the late territory of Michigan, or to any committee, trustees, or other persons, for the use and benefit of such county, shall be deemed to be the property of such county; and all such conveyances shall have the same force and effect as if they had been made to the inhabitants of such counties by their respective corporate names.