Silvana is a rural community and census-designated place in Snohomish County, Washington, United States. Its population was 97 at the 2020 census. Silvana is located on Silvana Island in the Stillaguamish River floodplain. The name of the island is Silvana Island, an island east of Florence Island. The main channel of the river passes to the north of …Silvana is a rural community and census-designated place in Snohomish County, Washington, United States. Its population was 97 at the 2020 census. Silvana is located on Silvana Island in the Stillaguamish River floodplain. The name of the island is Silvana Island, an island east of Florence Island. The main channel of the river passes to the north of Silvana Island, while South Slough to the southwest and Cook Slough to the southeast also form the general boundaries of the community. It is located at 48°12′8″N 122°15′19″W / 48.20222°N 122.25528°W. According to the United States Census Bureau, the CDP has a total area of 1.5 square miles, all of it land.
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