Toronto is a city in eastern Jefferson County, Ohio, located along the Ohio River 6 miles northeast of Steubenville. The population was 5,303 at …Toronto is a city in eastern Jefferson County, Ohio, located along the Ohio River 6 miles northeast of Steubenville. The population was 5,303 at the time of the 2020 census, making it the second-largest city in Jefferson County. It is part of the Weirton–Steubenville metropolitan area.