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
Population
City
9863250,837Longview
9862627,000Kelso
9867415,679Woodland
986119,341Castle Rock
986256,827Kalama
986452,044Silverlake
986031,192Ariel
98649849Toutle
98581425Ryderwood
986090Carrolls

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