Wis. Stat. § 77.265

(1) The department of revenue shall distribute information from the returns to local assessors. The local assessors shall maintain the confidentiality of social security numbers and telephone numbers from the returns.

(2) The local assessor shall permit the inspection of all returns filed under this subchapter for property within any local unit of government for which property taxes are levied by the chief elected official, or a person designated by the official, of that unit upon the adoption of a resolution by the governing body of the unit directing the official to inspect the returns for the purpose of reviewing the basis upon which equalized values were established by the department of revenue under s. 70.57 , and the official or designee shall maintain the confidentiality of grantor and grantee social security numbers and telephone numbers from the returns.

(3) The returns may be used in any proceeding involving the requisite amount of the fee and may be produced in any proceeding subject to a valid subpoena or court order, but the court, or adjudicating agency, and the parties shall maintain the confidentially of social security numbers and telephone numbers from the returns.

(4) The department of workforce development may use the returns under s. 106.50 , but shall maintain the confidentiality of social security numbers and telephone numbers from the returns.

(5) The department of revenue, county real property listers under s. 70.09 , and local assessors and their employees and agents may use the returns, but shall maintain the confidentiality of social security numbers and telephone numbers from the returns.

(6) Governmental agencies that acquire real property for public purposes, or that administer taxes, may use the returns, but shall maintain the confidentiality of social security numbers and telephone numbers from the returns.

(7) In a condemnation proceeding or in an appeal of an assessment of real property, the property owners and the owners' agents may inspect the returns after signing a written agreement to maintain the confidentiality of social security numbers and telephone numbers from the returns inspected.

(8) A county may use the returns to develop a tract index, but shall maintain the confidentiality of social security numbers and telephone numbers from the returns.

(9) The department of revenue may make available to the public all information obtained from the returns except social security numbers and telephone numbers from the returns.