Indiana Code Title 3. Elections § 3-8-2.5-5

Sec. 5. (a) If a school corporation is located entirely within one (1) county, a petition of nomination for the candidate to a school board office must be filed with the county voter registration office of the county.  The county voter registration office of the county shall examine the voter registration records of the election district to determine if each petitioner is eligible to vote for the candidates being nominated by the petition.

(b) If a school corporation is located within more than one (1) county, a petition of nomination for the candidate to a school board office must be filed with the county voter registration office of the county having the greatest percentage of population of the school corporation.  The county voter registration office shall examine the voter registration records of each county in the election district to determine if each petitioner is eligible to vote for the candidates being nominated by the petition.

(c) When the county voter registration office has completed its determination under subsection (a) or (b), the office shall forward the petitions of nomination to the circuit court clerk.

(d) This subsection applies if a school corporation is located within more than one (1) county.  The circuit court clerk of the county having the greatest percentage of population of the school corporation shall promptly certify the names of each of the candidates on the petition to the county election board of each other county in which the school corporation is located.