There are 10 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
Population
City
9933651,329Kennewick
9935235,618Richland
9933732,581Kennewick
9935425,676Richland
9933818,312Kennewick
9935318,264West Richland
9935014,287Prosser
9932010,023Benton City
99346372Plymouth
99345164Paterson
showing: 10 rows

Zip Codes in Benton County, Washington by Population (2024)