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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 98028 Kenmore 206, 425
King County WA 98029 Issaquah 425
King County WA 98030 Kent 253
King County WA 98031 Kent 253, 425
King County WA 98032 Kent 206, 253, 425
King County WA 98033 Kirkland 206, 425
King County WA 98034 Kirkland 206, 425
King County WA 98035 Kent 253
King County WA 98038 Maple Valley 253, 360, 425, 564
King County WA 98039 Medina 206, 425
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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.