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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Wisconsin ZIP Codes

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

State ZIP Code City County Area Codes
WI 54140 Little Chute Outagamie County 920
WI 54141 Little Suamico Oconto County 920
WI 54143 Marinette Marinette County 534, 715, 906
WI 54149 Mountain Oconto County 534, 715, 920
WI 54150 Neopit Menominee County 534, 715
WI 54151 Niagara Marinette County 534, 715, 906
WI 54152 Nichols Outagamie County 920
WI 54153 Oconto Oconto County 534, 715, 920
WI 54154 Oconto Falls Oconto County 534, 715, 920
WI 54155 Oneida 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.