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Zip Code 53545 — Janesville, WI

53545 is a ZIP Code associated with Janesville, WI, located within Rock. The postal region supports an estimated population of 24,703 residents across Data Pending housing units, with a population density of 423.8 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (42.731130, -89.036130)

Data MetricLocal Statistic
Postal / Zip Code53545
Primary CityJanesville
State / ProvinceWI
CountyRock
Total Population24,703
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density423.8 people/sq mi
TimezoneAmerica/Chicago

How 53545 Compares

MetricZIP 53545Rock CountyWI State Average
Population24,703170,4145,914,913
Median IncomeData PendingN/AN/A
Population Density423.8 /sq mi----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 53548Janesville5.6 mi19,916N/A
Zip 53563Milton6.4 mi11,280N/A
Zip 53546Janesville7.1 mi29,867N/A
Zip 53534Edgerton8.5 mi12,241N/A
Zip 53501Afton8.9 mi165N/A

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →