There are 10 zip codes in Cowlitz County, Washington. The most populated is 98632, located in Longview. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
City
Population
98632Longview50,837
98626Kelso27,000
98674Woodland15,679
98611Castle Rock9,341
98625Kalama6,827
98645Silverlake2,044
98603Ariel1,192
98649Toutle849
98581Ryderwood425
98609Carrolls0

Cowlitz County, Washington Zip Codes by Population (2024)