A post office called Sylvania was established in 1869, and remained in operation until 1907. The community's name is derived from Pennsylvania, the home base state of a coal company operating in the area.
- U.S. Geological Survey Geographic Names Information System: Sylvania, Missouri
- "Post Offices". Jim Forte Postal History. Retrieved 25 September 2016.
- "Dade County Place Names, 1928–1945 (archived)". The State Historical Society of Missouri. Retrieved 25 September 2016.