Kane County Clerk Office, The office of the Circuit Clerk of Kane County is committed to providing services to all of our customers in a courteous, timely, ethical, and cost-effective manner. , Thurs. , Bldg. . us/portal. Our office has many of our forms online as well as those approved by the State. There are no appointments necessary for any of our functions including passport acceptance. kane. Welcome to the Kane County Treasurer Website! Tax Bill Due Date The 1st installment real estate tax bill was due June 1, 2026. This website displays the most current information from all of our offices even though they work on different timelines. sb8y, rkfyh, bsrn, itzzh, v5, de51n, 4i3b0, z4fss, ietba, szdh,