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 99104 Belmont Whitman County 509
WA 99105 Benge Adams County 509
WA 99107 Boyds Ferry County 509
WA 99109 Chewelah Stevens County 509
WA 99110 Clayton Stevens County 509
WA 99111 Colfax Whitman County 509
WA 99113 Colton Whitman County 509
WA 99114 Colville Stevens County 236, 250, 509, 672, 778
WA 99115 Coulee City Grant County 509
WA 99116 Coulee Dam Okanogan County 509
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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.