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ZIP Code Database - Facts & Stats

Data Last Updated: May 1, 2023

ZIP Codes for City of Lake Forest, IL

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Counties:LAKE, IL
Area Code(s):847, 224
Timezone(s):Central (GMT -06:00)
City Population:19,375 (More Details)
CBSA:Chicago-Naperville-Elgin, IL-IN-WI
Congressional District(s):10
Land Area:444 square miles (county)
Water Area:925 square miles (county)

1 ZIP Code

Lake Forest, IL ZIP Code Boundaries

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Lake Forest, IL Covers 1 ZIP Code

ZIP CodeTypePopulation% of PopulationAliases

Lake Forest, IL Demographic Information *

Total population**19,375
Male population9,344
Female population10,031
Median age (years)45.5
White Population17,846
Black Population213
Indian Population28
Asian Population904
Hawaiian Population1
Hispanic Population542
Median age (Male)45
Median age (Female)46
Total households6,763
Family households (families)5,247
Average household size2.68
Average family size3.11
Total housing units7,444
* Demographic data is based on 2010 Census for the City of LAKE FOREST.
** 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],