Wis. Stat. § 75.50
Current through Acts 2023-2024, ch. 272
If the county as plaintiff in such action cannot ascertain who are the proper persons to make defendants as to any tract or parcel of land described in the complaint, it may allege the fact in the complaint and they may be proceeded against as nonresident defendants and shall be described in the proceedings as unknown owners.
Wis. Stat. § 75.50