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ZIP Code Database - Facts & Stats

Data Last Updated: June 1, 2023

ZIP Codes for City of Cortland, IL

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Counties:DEKALB, IL
Area Code(s):815, 779
Timezone(s):Central (GMT -06:00)
City Population:4,270 (More Details)
CBSA:Chicago-Naperville-Elgin, IL-IN-WI
Congressional District(s):14
Land Area:631 square miles (county)
Water Area:3 square miles (county)

1 ZIP Code

Cortland, IL ZIP Code Boundaries

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Cortland, IL Covers 1 ZIP Code

ZIP CodeTypePopulation% of PopulationAliases

Cortland, IL Demographic Information *

Total population**4,270
Male population2,112
Female population2,158
Median age (years)29.5
White Population3,667
Black Population233
Indian Population21
Asian Population73
Hawaiian Population0
Hispanic Population527
Median age (Male)29.7
Median age (Female)29.4
Total households1,423
Family households (families)1,119
Average household size3
Average family size3.32
Total housing units1,530
* Demographic data is based on 2010 Census for the City of CORTLAND.
** 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],