Hat Island, Washington

Hat Island, Washington
č̓əč̓əsəliʔ
Hat Island aerial view from the east
Hat Island, Washington
Location of Hat Island, Washington.
Coordinates: 48°0′48″N 122°19′14″W / 48.01333°N 122.32056°W / 48.01333; -122.32056
CountryUnited States
StateWashington
CountySnohomish
Area
 • Total
0.69 sq mi (1.79 km2)
 • Land0.69 sq mi (1.78 km2)
 • Water0.0039 sq mi (0.01 km2)
Elevation
207 ft (63 m)
Population
 (2025)
 • Total
26
 • Density38/sq mi (14.6/km2)
Time zoneUTC-8 (Pacific (PST))
 • Summer (DST)UTC-7 (PDT)
ZIP code
98201
Area code360
GNIS feature ID2584980

Hat Island (Lushootseed: č̓əč̓əsəliʔ), also known as Gedney Island, is a small island in Possession Sound in the U.S. state of Washington. The island is covered by a census-designated place (CDP) that is part of Snohomish County. The population is 26 as of 2025. The island lies between the mainland city of Everett, Washington, and the southern part of Whidbey Island; it has a land area of 1.768 km2 (436.8 acres).