Wis. Stat. § 74.125: Public depositories.

The taxation district treasurer or county treasurer, as appropriate, may designate one or more public depositories, among those previously designated under s. 34.05, to which taxpayers may make payments under ss. 74.11 and 74.12. A receipt for such payments issued by a designated public depository has the same legal status as a receipt issued by the taxation district treasurer or county treasurer.