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U.S. ZIP Codes Database 2026

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Wahkiakum County ZIP Codes

Browse all ZIP Codes, cities, and associated area codes registered in Wahkiakum County.

County State ZIP Code City Area Codes
Wahkiakum County WA 98612 Cathlamet 360, 503, 564, 971
Wahkiakum County WA 98621 Grays River 360, 564
Wahkiakum County WA 98643 Rosburg 360, 503, 564, 971
Wahkiakum County WA 98647 Skamokawa 360, 503, 564, 971

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About U.S. ZIP Codes

ZIP codes are a United States Postal Service system introduced in 1963 to make mail routing more accurate and efficient. The standard format uses five digits, while ZIP+4 adds four more digits for a more precise delivery segment.

ZIP codes cover the United States, its territories, military mail routes, and other USPS delivery points. This directory organizes that data for practical lookup by ZIP code, city, county, and state.