Courthouse Location County Offices will be closed Thursday, November 23rd and Friday, November 24th in observance of the Thanksgiving Holiday. Ottawa County partnered with the Treasurer of Ohio to display Ottawa County's spending through Ohio Checkbook.com. To view the site, click on the link on the left labeled "Ottawa County's Checkbook." 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.