10 Most Populated ZIP Codes in Illinois
The top ZIP code for population in Illinois is 60629 (Chicago, Cook County), with a population of 109,292. Across the top 10 most populated ZIP codes in Illinois, population ranges from 109,292 to 77,061, covering communities from Chicago to Chicago.
Ranked list
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Methodology
Rankings are derived from the U.S. Census Bureau American Community Survey 5-Year Estimates, vintage 2019 to 2023, joined to USPS ZIP Code Tabulation Areas. We rank by population and surface the top 10 ZIP codes within Illinois. Values reflect ZCTA-level estimates and may differ slightly from city-level figures. Compiled and reviewed by the Zip Code Near Me Data Team.
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Most Populated ZIP Codes in other states
Reviewed by Zip Code Near Me Data Team. Last verified June 13, 2026.