Courthouse Location Ottawa County Offices are open for business with limited staff, but closed to the public at this time. Visitors will only be permitted access with a scheduled appointment. There are drop boxes on the outside of the courthouse where you can deposit your water/sewer and/or tax payments. Ottawa County sells it's surplus county property through internet auctions. To view current items available, click on the Gov Deals link on our web page. The Ottawa County Courthouse is located at 315 Madison Street, Port Clinton, Ohio.