U.S. postal lookup

U.S. ZIP Codes Database 2026

Search by ZIP code, city, county, or state and find clear postal details with maps, time zones, and area code data.

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King County ZIP Codes

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

County State ZIP Code City Area Codes
King County WA 98195 Seattle 206
King County WA 98198 Seattle 206, 253
King County WA 98199 Seattle 206
King County WA 98224 Baring 360, 425, 564
King County WA 98288 Skykomish 360, 425, 509, 564
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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.