Postponed Property Taxes Due July 31: The second half installment of the 2023 property taxes ( payable in 2024) are due July 31, 2024 to the Columbia County Treasurer.  Payments can be mailed to the following address.           Treasurer           P.O. Box 198           112 E Edgewater St            Portage, WI 53901    Online payments may be made also.  Instructions for Online Real Estate Payments