Kitsap County, originally part of King and Jefferson counties, is the northern end of the Kitsap peninsula, jutting into the Puget Sound positioned between the Olympic Peninsula to the west and King County to the east. It is located between Hood Canal and Admiralty Strait. Water transportation is dominant in the culture and economy of the county. The county, initially named Slaughter County for a U.S. Army officer, was formed in 1857. Voters later changed the name to honor Kitsap, the Suquamish war chief. The county seat is at Port Orchard.
Kitsap County is one of the smallest counties in the state in terms of land area at about 395 square miles. It ranks third, however, in the state in terms of its population density, with 636 people per square mile.