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Illinois population by year, 1990 to 2025

Illinois peaked at 12.90 million in 2013 and now stands at 12.72 million, trading fifth place with Pennsylvania along the way.

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What the data shows

  • Illinois: 11.45M in 1990, 12.72M in 2025. It peaked at 12.90M in 2013.

About this chart

Illinois reached its highest population in 2013, at 12,895,778, and has been below that mark in every year since. The 2025 estimate is 12,719,141, about 177,000 lower. The state is up only 2.3 percent since 2000 and is down 0.9 percent from 2010 (12,840,545), though it remains larger than in 1990, when it had 11,446,979 people.

Pennsylvania has taken the ground Illinois lost. Illinois ranked 6th among the states in 1990, 5th in 2000 and 2010, and 6th in 2025, while Pennsylvania moved the other way. The estimates dipped in 2021 and 2022 before recovering slightly, and they come from the Census Bureau for July 1 of each year.

The data

Source: U.S. Census Bureau population estimates, July 1 (vintages 1999, 2000–2010 intercensal, 2020 and 2025), resident population of Illinois, millions. Retrieved November 4, 2026.

Population of Illinois, Residents, 1990 to 2025, 1990–2025
DateIllinois
199011.45M
199111.54M
199211.64M
199311.73M
199411.81M
199511.89M
199611.95M
199712.01M
199812.07M
199912.13M
200012.43M
200112.49M
200212.53M
200312.56M
200412.59M
200512.61M
200612.64M
200712.70M
200812.75M
200912.80M
201012.84M
201112.87M
201212.88M
201312.90M
201412.89M
201512.86M
201612.82M
201712.78M
201812.73M
201912.67M
202012.80M
202112.70M
202212.61M
202312.63M
202412.70M
202512.72M

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Frequently asked questions

What is the population of Illinois?

Illinois had about 12.72 million residents (12,719,141) in July 2025, according to Census Bureau estimates. That ranks 6th among the 50 states.

Is Illinois losing population?

Compared with its peak, yes. Illinois reached 12,895,778 in 2013, and the 2025 estimate is about 177,000 lower. It is down 0.9 percent since 2010.

When did Illinois' population peak?

Illinois peaked in 2013 at 12,895,778. It fell each year through 2019, jumped in the 2020 estimate, and has recovered only part of the way since, to 12.72 million in 2025.

Where does this data come from?

U.S. Census Bureau population estimates, July 1 (vintages 1999, 2000–2010 intercensal, 2020 and 2025), resident population of Illinois, millions. Retrieved November 4, 2026. You can download the full table as a CSV from this page.

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