King County is in Washington State, Not California

King County is located in the state of Washington, not California. It is the most populous county in Washington and the 13th most populous in the United States.

Key Facts:

• County Seat: Seattle (also the state's largest city).
• Region: Puget Sound, Pacific Northwest.
• Named After: Originally William R. King (VP under Pierce); rededicated in 1986 to Dr. Martin Luther King Jr.
• Major Cities: Seattle, Bellevue, Kent, Renton, Federal Way, Kirkland, Redmond (Microsoft HQ).

California has its own King City (Monterey County) and Kings County (Central Valley), but no King County.