Mich. Comp. Laws § 730.402
The city clerk and city assessor or other assessing officer shall, on or before October first of each year, prepare a list in duplicate of the names and addresses of not less than 1 resident of the county for each 1,000 inhabitants of such county, according to the last federal census taken previous to the preparation of any such list, and in no case shall less than 100 names be placed on such list. The above named officials shall then sign each copy and shall certify thereon that every person whose name and address appears thereon is to the best of his knowledge legally qualified and that such list is a true list of the names and addresses of the persons selected. The said officials shall then, on or before October first, file 1 copy with the city clerk and 1 copy with the clerk of the court; and juries may be drawn during the ensuing calendar year from the said list in the manner and under the conditions hereinafter set forth.
MCL 730.402