Silverdale is a census-designated place (CDP) in Kitsap County, Washington, in the United States. The population was 19,204 at the 2010 census. Despite many attempts at incorporation, Silverdale remains an unincorporated community.

Silverdale ranks 158th in the course of 522 areas in Washington for which per capita allowance data is collected.

Silverdale is located on the Kitsap Peninsula at 47°39′34″N 122°40′36″W / 47.65944°N 122.67667°W / 47.65944; -122.67667 (47.659410, -122.676630). It is 9 miles (14 km) northwest of the city of Bremerton and the thesame distance south of Poulsbo. Silverdale lies at the north tip of Dyes Inlet, which connects it to Bremerton via Sinclair Inlet and to the Pacific Ocean via Port Orchard and Puget Sound.

According to the United States Census Bureau, the CDP of Silverdale has a total Place of 13.6 square miles (35.2 km²), of which 12.6 square miles (32.7 km²) are estate and 0.97 square miles (2.5 km²), or 7.10%, are water.

As of the census of 2010, there were 19,204 people, 5,867 households, and 4,059 families residing in the CDP. The population density was 2,277.9 people per square mile (879.9/km²). There were 6,246 housing units at an average density of 899.6 per square mile (347.5/km²). The racial makeup of the CDP in 2005 was 74.9% White, 9.8% Asian, 3.5% African American, 1.9% Native American, 1.1% Pacific Islander, 1.45% from further races, and 5.01% from two or more races. Hispanic or Latino of any race were 4.4% of the population.