(1)   

      (a)    Except as provided in pars. (b), (c), and (d), school board members in a unified school district shall be electors of the school district and shall be elected at large, at large to numbered seats or at large to an apportioned election district area by a plurality vote of the electors of the school district. School board members in a unified school district shall be elected under s. 120.06 at the spring election. All candidates for school board seats shall file a declaration of candidacy as provided in s. 120.06 (6) (b).

      (b)    School board members in a unified school district that encompasses a city with a population greater than 150,000 but less than 500,000 shall be elected at large to numbered seats.

      (c)    School board members elected to a school board in an election under s. 117.22 (2) (bm) shall reside in the territory of the school district created by the reorganization.

      (d)   

         1.    School board members in a unified school district that encompasses a city with a population greater than 75,000 but less than 100,000 and that encompasses at least 2 villages may by resolution provide for the election of members from election districts established pursuant to a representation plan under sub. (1m) by a plurality of the electors of each election district within the school district.

         2.    Notwithstanding subd. 1., school board members in a unified school district that, on July 14, 2015, encompasses a city with a population greater than 75,000 but less than 100,000 and that encompasses at least 2 villages shall be elected from election districts established pursuant to a representation plan under sub. (1m) by a plurality of the electors of each election district within the school district.

   (1m)   

      (a)    The school board of a school district under sub. (1) (d) 1. that provides, pursuant to a resolution, for the election of members from election districts and the school board of a school district under sub. (1) (d) 2. shall establish a representation plan for the election of school board members by election district. The school board shall comply with all of the following in establishing the representation plan under this paragraph:

         1.    Provide for 9 election districts within the school district of substantially equal population.

         2.    Ensure that, to the extent practicable, each election district described in subd. 1. is compact.

         3.    Ensure that, to the extent practicable, the territory within each election district described in subd. 1. is contiguous.

         4.    Ensure that, to the extent practicable, the boundaries of each election district described in subd. 1. and the boundaries of municipalities encompassed within the school district are congruent.

         5.    Number the election districts and divide them into 3 classes such that one-third of the members of the school board shall be elected in each year.

      (b)    The school board shall adopt a district apportionment plan that apportions the territory of the school district into election districts pursuant to the representation plan as follows:

         1.    Within 60 days after establishing the representation plan under par. (a).

         2.    Within 60 days after the population count by census block, established in the decennial federal census of population, and maps showing the location and numbering of census blocks become available in printed form from the federal government or are published for distribution by an agency of this state and decennially thereafter.

      (c)    Upon adoption of the plan under par. (b), all of the following apply:

         1.    Candidates for school board member shall file as candidate for an identified election district.

         2.    Members of the school board shall reside in the election district within the school district from which they are elected.

      (d)    A district apportionment plan adopted under par. (b) after the spring election and before November 1 in any year shall be implemented at the spring election following adoption of the plan. A district apportionment plan adopted after November 1 in any year shall be implemented at the 2nd following spring election.

      (e)    Notwithstanding sub. (2), at the first election in which a district apportionment plan adopted under par. (b) is implemented, all of the following apply:

         1.    The first class of election districts from which members of the school board are elected shall be elected to serve a term of one year.

         2.    The 2nd class of election districts from which members of the school board are elected shall be elected to serve a term of 2 years.

         3.    The 3rd class of election districts from which members of the school board are elected shall be elected to serve a term of 3 years.

         4.    The incumbent members of the school board who hold office at the time of the first election shall cease to hold office at the time the members elected in that first election take office.

   (2)   The regular terms of school board members shall be for 3 years. School board members elected for regular or unexpired terms shall take office, if they have taken and filed the official oath, on the 4th Monday in April. Elections to fill unexpired terms shall be held simultaneously with the elections for regular terms. In school districts electing members of the school board at large, the regular terms shall be filled by the appropriate number of candidates receiving the highest number of votes and the unexpired terms shall be filled by the appropriate number of candidates receiving the next highest number of votes.

   (3)   All vacancies shall be filled by appointment, in accordance with s. 17.26 (1g) (a) or (1m).

   (4)   If a school district votes, pursuant to s. 120.02 (4) to adopt a plan requiring school board members to be elected to numbered seats, the school board shall, at its first meeting after the adoption of such plan, assign a number to each seat on the school board. Thereafter candidates for school board membership shall file as candidates for a particular numbered seat on the school board.