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 53511 Beloit Rock County 608, 779, 815
WI 53512 Beloit Rock County 608
WI 53515 Black Earth Dane County 608
WI 53516 Blanchardville Lafayette County 608
WI 53517 Blue Mounds Dane County 608
WI 53518 Blue River Richland County 608
WI 53520 Brodhead Green County 608, 779, 815
WI 53521 Brooklyn Dane County 608
WI 53522 Browntown Green County 608, 779, 815
WI 53523 Cambridge Dane County 608, 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.