Real estate taxes due Wednesday, July 12 Posted on July 6, 2023 0 Hardin County Treasurer, Denise Althauser reminds all property owners that real estate tax payments are due Wednesday, July 12.  The last day to pay manufactured home (trailer) tax in Hardin County without penalty is Wednesday, July 26. If you have questions contact the treasurer’s office located on the second floor of the courthouse or by calling 419-674-2246.