|Benton County Washington Cities/Towns - Benton City, Finley, Highland, Kennewick, Paterson, Plymouth, Prosser (County Seat), Richland, West Richland
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Benton County is a county located in the U.S. state of Washington. In 2000, its population was 142,475. The county seat is Prosser.
It was named after Missouri Senator Thomas Hart Benton. Benton County was created out of Klickitat County on March 8, 1905.