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ZIP Code Database - Facts & Stats

Data Last Updated: June 1, 2023

ZIP Codes for City of Oswego, IL

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Counties:KENDALL, IL
Area Code(s):331, 630
Timezone(s):Central (GMT -06:00)
City Population:30,355 (More Details)
CBSA:Chicago-Naperville-Elgin, IL-IN-WI
Congressional District(s):14
Land Area:320 square miles (county)
Water Area:2 square miles (county)

1 ZIP Code

Oswego, IL ZIP Code Boundaries

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Oswego, IL Covers 1 ZIP Code

ZIP CodeTypePopulation% of PopulationAliases

Oswego, IL Demographic Information *

Total population**30,355
Male population14,919
Female population15,436
Median age (years)33.9
White Population25,998
Black Population1,565
Indian Population74
Asian Population1,042
Hawaiian Population10
Hispanic Population3,556
Median age (Male)33
Median age (Female)34.6
Total households9,935
Family households (families)8,027
Average household size3.05
Average family size3.43
Total housing units10,388
* Demographic data is based on 2010 Census for the City of OSWEGO.
** 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],