Sylvan is a populated place LOCATED WITHIN the City of Portland. In turn, the City of Portland is located within Multnomah County.
Sylvan is located at latitude 45.509 and longitude -122.736.
Since Sylvan is located within the City of Portland, all of the census and demographic data for residents of Sylvan are included as part of the information reported for City of Portland in the "Profile" tab above.