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ZIP Code Database - Facts & Stats

Data Last Updated: March 1, 2023

ZIP Codes for City of Janesville, IA

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Counties:BREMER, IA
Area Code(s):319
Timezone(s):Central (GMT -06:00)
City Population:930 (More Details)
CBSA:Waterloo-Cedar Falls, IA
Congressional District(s):02
Land Area:435 square miles (county)
Water Area:4 square miles (county)

1 ZIP Code

Janesville, IA ZIP Code Boundaries

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Janesville, IA Covers 1 ZIP Code

ZIP CodeTypePopulation% of PopulationAliases

Janesville, IA Demographic Information *

Total population**930
Male population461
Female population469
Median age (years)40.2
White Population915
Black Population6
Indian Population0
Asian Population2
Hawaiian Population0
Hispanic Population3
Median age (Male)39.9
Median age (Female)40.5
Total households398
Family households (families)262
Average household size2.34
Average family size2.9
Total housing units409
* Demographic data is based on 2010 Census for the City of JANESVILLE.
** City and ZIP Code Population will not be equal due to differences in their geographies.


  1. U.S. Postal Service [Last Updated: 2/1/2023],
  2. Internal Data Creation [Last Updated: 2/1/2023],
  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],