Wis. Stat. § 115.435: Supplemental aid.

(1g) In this section, “membership” has the meaning given in s. 121.004 (5).

(1r) A school district that satisfies all of the following criteria may apply to the department by October 15 of each school year for a grant to supplement aid under s. 121.08:

(a) The school district’s membership in the previous school year was no more than 500 pupils.

(b) The school district is at least 200 square miles in area. The clerks of the municipalities within which the school district is located shall verify the school district’s area on a form prepared by the department.

(c) At least 80 percent of the real property in the school district is exempt from taxation under s. 70.11, taxed as forest croplands under subch. I of ch. 77, owned by or held in trust for a federally recognized American Indian tribe, or owned by the federal government. The clerks of the municipalities within which the school district is located shall verify the information required under this paragraph on a form prepared by the department.

(2) No later than June 30 of the current school year, the department shall, from the appropriation under s. 20.255 (2) (ad), pay each school district that satisfies the criteria under sub. (1r) $350 multiplied by the school district membership in the previous school year. If the appropriation under s. 20.255 (2) (ad) is insufficient to pay the full amount under this subsection, the funds shall be prorated among the entitled school districts.