Sylvania is a city in Lucas County, Ohio, United States. The population was 18,965 at the 2010 census. Sylvania is a suburb of Toledo. Its northern border is the southern border of the State of Michigan.HistorySylvania was platted in 1836. A post office called Sylvania has been in operation since 1859. Sylvania was incorporated in 1867.GeographySylvania is located at .According to the United States Census Bureau, the city has a total area of 6.53sqmi, of which, 6.48sqmi is land and 0.05sqmi is water.Sylvania is approximately 10 miles west-northwest of Toledo, Ohio.Demographics2010 censusAs of the census of 2010, there were 18,965 people, 7,642 households, and 5,092 families residing in the city. The population density was 2926.7PD/sqmi. There were 8,165 housing units at an average density of 1260.0/sqmi. The racial makeup of the city was 92.4% White, 2.7% African American, 0.1% Native American, 2.3% Asian, 0.1% Pacific Islander, 0.7% from other races, and 1.7% from two or more races. Hispanic or Latino of any race were 2.9% of the population.