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
All states and U.S. territories
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State directory

Wisconsin ZIP Codes

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

State ZIP Code City County Area Codes
WI 54234 Sister Bay Door County 920
WI 54235 Sturgeon Bay Door County 920
WI 54240 Tisch Mills Manitowoc County 920
WI 54241 Two Rivers Manitowoc County 920
WI 54245 Valders Manitowoc County 920
WI 54246 Washington Island Door County 920
WI 54247 Whitelaw Manitowoc County 920
WI 54301 Green Bay Brown County 920
WI 54302 Green Bay Brown County 920
WI 54303 Green Bay Brown County 920
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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.