Bainbridge Island is a city and island in Kitsap County, Washington. It is located in Puget Sound. The population was 23,025 at the 2010 census and an estimated 25,298 in 2019, making Bainbridge Island the second largest city in Kitsap County.
Bainbridge Island is connected to the Kitsap Peninsula by the Agate Pass Bridge, carrying SR 305 over Agate Passage at the island’s northwest corner.
Bainbridge Island was formed during the last ice age—13,000 to 15,000 years ago—when the 3,000-foot-thick (910 m) Vashon Glacier scraped out the Puget Sound and Hood Canal basins.
The island is about 5 miles (8 km) wide and 10 miles (16 km) long, encompassing nearly 17,778 acres (27.778 sq mi; 71.95 km2), and is one of Puget Sound’s larger islands.
