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

Wisconsin ZIP Codes

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

State	ZIP Code	City	County	Area Codes
WI	53546	Janesville	Rock County	`608`
WI	53547	Janesville	Rock County	`608`
WI	53548	Janesville	Rock County	`608`
WI	53549	Jefferson	Jefferson County	`262, 920`
WI	53550	Juda	Green County	`608, 779, 815`
WI	53551	Lake Mills	Jefferson County	`920`
WI	53553	Linden	Iowa County	`608`
WI	53554	Livingston	Grant County	`608`
WI	53555	Lodi	Columbia County	`608`
WI	53556	Lone Rock	Richland County	`608`

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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.