Quilcene is an unincorporated community and census-designated place in Jefferson County, Washington, United States. The population was 598 at the 2020 census. The community is located on the Olympic Peninsula at the head of Quilcene Bay, an arm of the seawater-filled glacial valley of Hood Canal. Each year many visitors enjoy the panoramic views of …Quilcene is an unincorporated community and census-designated place in Jefferson County, Washington, United States. The population was 598 at the 2020 census. The community is located on the Olympic Peninsula at the head of Quilcene Bay, an arm of the seawater-filled glacial valley of Hood Canal. Each year many visitors enjoy the panoramic views of Mount Rainier, Puget Sound and Seattle from the 2,804-foot summit of nearby Mount Walker, the only peak facing Puget Sound that has a road to its summit. The Olympic National Forest lands in Quilcene hold Douglas fir, spring-blooming Pacific rhododendrons, Oregon grape, and salal. Leland Lake is located north of Quilcene.