Port Clinton is a city in and the county seat of Ottawa County, Ohio, United States, located at the mouth of the Portage River on Lake Erie. The population was 6,025 at the 2020 census. It is the principal city of the Port Clinton micropolitan area, about 34 miles southeast of Toledo. The city has been nicknamed the "Walleye Capital of the World", due to the productive fishing waters for the species lying offshore in Lake Erie's Western Basin.