Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — CITY/WI/JANESVILLE

Janesville ZIP codes, Wisconsin

Janesville, WI has 4 ZIP codes (53546, 53545, 53548 and 53547) and area code 608. The largest is 53546.

USPS city name
4 ZIP codes
Overlapping the city
1 more
Population
66,030
Area code
608

Mail addressed to Janesville uses the ZIP codes above. 1 more ZIP code covers part of the city but is addressed as somewhere else; they are listed separately below.

Janesville in numbers

About 66,030 people live in Janesville, in 28,326 households, the 10th-largest of Wisconsin's 805 census places. The median household income is $73,446 a year, 5% below the Wisconsin median of $77,485 (US: $80,734). The median owner-occupied home is valued at $223,400 (16% below the Wisconsin median), and median gross rent is $1,054 a month. The median age is 40.7; 27.3% of adults 25 and over hold a bachelor's degree or higher (33.4% across Wisconsin); the average commute takes 22 minutes.

Population66,030Janesville66,030
Households28,326Janesville28,326
Median age40.7Janesville40.7Wisconsin40.2US 38.9
Median household income$73,446Janesville$73,446Wisconsin$77,485US $80,734
Median home value$223,400Janesville$223,400Wisconsin$266,500US $332,700
Median gross rent$1,054Janesville$1,054Wisconsin$1,087US $1,413
Bachelor's degree or higher27.3%Janesville27.3%Wisconsin33.4%US 35.7%
Mean commute21.9 minJanesville21.9 minWisconsin22.2 minUS 26.4 min
Population density1,906 / sq miJanesville1,906 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, for the census place Janesville city. Survey estimates carry margins of error, wider for small places. Sources and methods.

ZIP codes addressed as Janesville

ZIP codes with the USPS city name Janesville
ZIP City Type Population Median income Median home
53546 Janesville , WI Standard 29,867 $75,825 $239,400
53545 Janesville , WI Standard 24,703 $73,889 $220,700
53548 Janesville , WI Standard 19,916 $76,869 $234,900
53547 Janesville , WI No street area — — —

Other ZIP codes overlapping Janesville

These ZIP codes cover part of Janesville but are addressed as somewhere else.

ZIP codes overlapping Janesville
ZIP City Type Population Median income Median home
53563 Milton , WI Standard 11,280 $89,528 $293,800

Map of Janesville ZIP codes

53546535455354853547

The ZIP codes of Janesville, WI, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Towns near Janesville

The nearest larger towns are Rockford, IL (147,521 people, 30 mi), Madison (278,001 people, 35 mi) and Waukesha (71,233 people, 45 mi).

Towns near Janesville
TownPopulationDistance
Milton 5,706 7.2 mi
Edgerton 6,014 11.0 mi
Beloit 36,534 11.1 mi
South Beloit, IL 7,946 13.8 mi
Evansville 5,782 15.7 mi
Rockton, IL 7,974 16.6 mi
Whitewater 15,807 17.6 mi
Roscoe, IL 10,706 17.9 mi
Fort Atkinson 12,463 18.6 mi
Brodhead 3,197 19.0 mi
Stoughton 13,033 19.6 mi
Delavan 8,689 19.8 mi
Delavan Lake 2,757 20.6 mi
Machesney Park, IL 22,630 21.9 mi

More nearby: every ZIP code in Rock County · Wisconsin ZIP codes

Cite this page

zipcodes.pro. “Janesville, WI ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/wi/janesville

Underlying data is public domain or openly licensed — sources, vintages and licences.