Janesville WI ZIP Code
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Janesville city is located in Wisconsin State, Rock County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Janesville WI zip code by its streets and block numbers if we have some of the Janesville streets loaded in our website
Janesville Area Code is 608 and Time Zone is Central (GMT -06:00).
Janesville Zip Code - Wisconsin
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Janesville City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Janesville ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Janesville, Wisconsin.
The Janesville Zip Code is 53545, 53546, 53547, 53548.
If you want to send a mail to Janesville City, you should use the 53545, 53546, 53547, 53548 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Janesville ZIP code system that it called ZIP+4, often called "plus-four codes", "add-on codes", or "add ons". A ZIP+4 code uses the basic 53545, 53546, 53547, 53548 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Janesville city block, a group of apartments, an individual high-volume receiver of mail or any other unit that could use an extra identifier to aid in efficient mail sorting and delivery in Wisconsin.