Sylvania is a town in DeKalb County, Alabama, United States.

Sylvania is located north of the center of DeKalb County at 34°33′30″N 85°47′46″W / 34.55833°N 85.79611°W / 34.55833; -85.79611 (34.558304, -85.796154).

[5] Alabama State Route 75 passes through the town limits, leading northeast to Henagar and southwest to Rainsville.

[4] At the 2000 census there were 1,186 people, 485 households, and 354 families living in the town.

There were 517 housing units at an average density of 70.6 per square mile (27.3/km2).

At the 2010 census there were 1,837 people, 674 households, and 505 families living in the town.

There were 750 housing units at an average density of 101.3 per square mile (39.1/km2).

As of the 2020 United States census, there were 1,790 people, 829 households, and 648 families residing in the town.