Mich. Comp. Laws § Article II § 1: Qualifications of electors; residence.

Sec. 1.

Every citizen of the United States who has attained the age of 21 years, who has resided in this state six months, and who meets the requirements of local residence provided by law, shall be an elector and qualified to vote in any election except as otherwise provided in this constitution. The legislature shall define residence for voting purposes.