Ottawa County, OH neighbors Lucas near Port Clinton metropolitan centre granting a 2020 estimated census population standing at 41,428 making it the 24th least populous county situated within Ohio overall. Its county seat is Port Clinton with other towns include Oak Harbor & Genoa-Port Clinton itself corresponds out to Ottawa's biggesttown aside from recognized country seat. This area had had been established from Sandusky and Erie Counties back in 1840 when local residents petitioned for new administrative boundaries - posthumously named after Native American Tribe Odawa suzerainty region preceding James K Polk .