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Zip Code 53545 — Janesville, WI

ZIP Code 53545 is associated with Janesville, WI, in Rock County. The listed population estimate is 24,703; estimated density is 423.8 people per square mile. Among records with population estimates, it ranks #3 of 13 in Rock County and #79 of 780 in WI.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (42.731130, -89.036130)

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

How 53545 Compares

MetricZIP 53545Rock County recordsWI records
Population estimate24,703170,414 (sum)5,914,913 (sum)
Population Density423.8 /sq mi----
County population rank#3 of 13----
State population rank#79 of 780----

Regional sums combine the population estimates in the listed ZIP records; they are not official county or state population totals.

Explore More ZIP Codes

Nearby ZIP Codes in WI

ZIP CodeCityDistancePopulation estimate
ZIP 53548Janesville5.6 mi19,916
ZIP 53563Milton6.4 mi11,280
ZIP 53546Janesville7.1 mi29,867
ZIP 53534Edgerton8.5 mi12,241
ZIP 53501Afton8.9 mi165

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 →