Compiled Laws, Chapter 168. Michigan Election Law § 168.661

Sec. 661. (1) Except as provided in subsection (2), city and township election commissions shall divide precincts according to law, not later than 210 days before the primary next preceding the general November election, and shall immediately notify the county clerk of the number of registered electors in each precinct in the city or township. The county clerk shall notify the secretary of state not later than 200 days before the primary of a precinct in the clerk's county that has not been divided according to law, and the secretary of state shall proceed to make divisions as are necessary at the expense of the city or township involved, not later than 180 days before the primary next preceding the general November election. A division of precincts must be made effective not later than 180 days before the primary election next preceding the general November election.

(2) In the second year following each federal decennial census, precincts must be divided under this subsection. City and township election commissions shall divide precincts not later than 120 days before the primary election next preceding the general November election in order that a precinct, as far as is practical, is not split between districts and does not exceed 4,999 registered electors, and shall immediately notify the county clerk of the number of registered electors in each precinct in each city or township. The county clerk shall notify the secretary of state not later than 110 days before the primary of any precincts in the county that have not been divided, and the secretary of state shall proceed to make the divisions as are necessary, at the expense of the city or township involved, not later than 90 days before the primary election next preceding the general November election. The division of precincts must be made effective not later than 90 days before the primary election. The secretary of state may authorize, on written request by a city or township election commission, a later division of a precinct that contains portions of more than 1 elective district. All precinct divisions must be completed not later than 90 days before the primary election next preceding the general November election. In determining the number of registered voters for a precinct under this subsection, a city or township election commission or the secretary of state, as applicable, must use only the active registered electors for that city or township.