There are 11 zip codes in Benton County, Washington. The most populated is 99336, located in Kennewick. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
City
Population
99336Kennewick51,329
99352Richland35,618
99337Kennewick32,581
99354Richland25,676
98944Sunnyside25,176
99338Kennewick18,312
99353West Richland18,264
99350Prosser14,287
99320Benton City10,023
99346Plymouth372
99345Paterson164

Benton County, Washington Zip Codes by Population (2024)