Benton County is a county in the south-central portion of the U.S. state of Washington. As of the 2020 census, its population was 206,873. The county seat is Prosser, and its most populous city is Kennewick. The Columbia River demarcates the... Wikipedia
Cities: Benton City, Richland, Kennewick, and more
County seat: Prosser
Congressional district: 4th
Largest city: Kennewick
Named for: Thomas Hart Benton