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.

42,735 verified records
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State directory

Washington ZIP Codes

Complete postal directory, details, and geographic map for the State of Washington.

State ZIP Code City County Area Codes
WA 98272 Monroe Snohomish County 360, 425, 564
WA 98273 Mount Vernon Skagit County 360, 564
WA 98274 Mount Vernon Skagit County 360, 564
WA 98275 Mukilteo Snohomish County 425
WA 98276 Nooksack Whatcom County 360, 564
WA 98277 Oak Harbor Island County 360, 564
WA 98278 Oak Harbor Island County 360, 564
WA 98279 Olga San Juan County 360, 564
WA 98280 Orcas San Juan County 360, 564
WA 98281 Point Roberts Whatcom County 236, 250, 360, 564, 604, 672, 778
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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.