Illinois - Population

12,549,689 (persons) in 2023

In 2023, population for Illinois was 12.5 million persons. Population of Illinois fell gradually from 12.9 million persons in 2014 to 12.5 million persons in 2023.

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What is population?

Annual Estimates of the Resident Population: 2018 Estimates The estimates are based on the 2010 Census and reflect changes to the April 1, 2010 population due to the Count Question Resolution program and geographic program revisions. All geographic boundaries for the 2018 population estimates series except statistical area delineations are as of July 1, 2019

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What is Illinois population?