High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! Sylvania Township is one of the eleven townships of Lucas County, Ohio, United States. As of 2000, the total population was 44,253, making it the second most populous county subdivision of Lucas County, as well as the third most populous in all of northwest Ohio and the 419 / 567 area codes (behind Toledo and Mansfield). It is also the 6th most populous township in Ohio.