Cowlitz County, Washington ZIP Codes

10 ZIP Codes

Zip Code
City
Population ↓
98632Longview50,635
98626Kelso26,892
98674Woodland17,525
98611Castle Rock9,302
98625Kalama7,655
98645Silverlake2,216
98603Ariel1,267
98649Toutle929
98581Ryderwood419
98609Carrolls0

Overview of ZIP Codes in Cowlitz County

ZCTAs are geographic areas created by the US Census Bureau to approximate the delivery areas of ZIP Codes for statistical analysis. While ZCTAs use the same five-digit codes as ZIP Codes, they represent defined geographic areas that may not exactly match the mail delivery routes of ZIP Codes.
10
ZIP Codes

The data shown reflect ZCTAs from the US Census. As of 2025, there are 10 ZCTAs in Cowlitz County, Washington (US Census).

Sources

  1. US Census: 2025 Gazetteer Files
  2. US Census: ZIP Code Tabulation Areas (ZCTAs)

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