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ZIP Code Database - Facts & Stats

Data Last Updated: December 1, 2022

ZIP Codes for City of Janesville, WI

Janesville, WI Covers 4 ZIP Codes

ZIP CodeTypeCountyPopulation
ZIP Code 53545StandardRock23,117
ZIP Code 53546StandardRock30,648
ZIP Code 53547P.O. BoxRock0
ZIP Code 53548StandardRock18,558

Timezone(s):Central (GMT -06:00)
Counties:ROCK, WI
Population:63,575 (More Details)
Male Population:31,102
Female Population:32,473
Median Age:37
ZIP Codes:4
Area Codes:1
Total Area:726 square miles (county)
Land Area:718 square miles (county)
Water Area:8 square miles (county)

Janesville, WI Demographic Information *

Total population63,575
Male population31,102
Female population32,473
Median age (years)37.1
White Population58,299
Black Population1,633
Indian Population187
Asian Population857
Hawaiian Population22
Hispanic Population3,421
Median age (Male)35.7
Median age (Female)38.6
Total households25,828
Family households (families)16,718
Average household size2.43
Average family size2.95
Total housing units27,996
* Demographic data is based on 2010 Census. Products


  1. U.S. Postal Service [Last Updated: 12/1/2022],
  2. Internal Data Creation [Last Updated: 12/1/2022],
  3. U.S. Geological Survey [Updated as needed],
  4. U.S. Census [Updated Yearly],
  5. U.S. Census 2010 [Decennial] [Last Updated: 1/1/2010],