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 99353 West Richland Benton County 509
WA 99354 Richland Benton County 509
WA 99356 Roosevelt Klickitat County 458, 509, 541
WA 99357 Royal City Grant County 509
WA 99359 Starbuck Columbia County 509
WA 99360 Touchet Walla Walla County 509
WA 99361 Waitsburg Walla Walla County 509
WA 99362 Walla Walla Walla Walla County 458, 509, 541
WA 99363 Wallula Walla Walla County 458, 509, 541
WA 99371 Washtucna Adams 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.