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Celebrating Illinois' 205th Anniversary of Statehood
Illinois became the 21st state on December 3, 1818. Explore Census Bureau data about Illinois using 2020 Census data, geographic profiles from data.census.gov, and other interactive data tools.
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Population and Demographics
Illinois is the 24th largest state by area. Learn more about the geography and history of Illinois.
Did you know:
- The top employed industry is educational services, health care, and social assistance.
- The percentage of people who moved to Illinois from a different state in the last year was 1.8%.
- The average commute is 27.9 minutes, compared to the United States average of 26.4 minutes.
Learn more about the state's business and economy on data.census.gov.
2020 Census Data
Illinois' population was 12,812,508 in 2020, a 0.1% decrease from 2010.
The results of the 2020 Census show that:
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2,813,039 or 22.0% of people in Illinois were under age 18. That's a decrease of 10.1% from 2010 to 2020.
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2,337,410 or 18.2% of people in Illinois reported Hispanic or Latino origin. That's an increase of 15.3% from 2010 to 2020.
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Fun Facts
🌳 The state tree is the White Oak.
🍿 The state snack is Popcorn.
💨🏙️ The largest city is Chicago.
🔎 Explore our State Facts for Students tool to learn more about Illinois and test your knowledge of Census Bureau data with interactive games from Statistics in Schools.
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Featured Resources for State Data
Check out these interactive data tools that you can use to find data about your state.
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About the Census Bureau
We serve as the nation’s leading provider of quality data about its people and economy. The Census Bureau is the federal government's largest statistical agency. As the world’s premier statistical agency, we are dedicated to making our nation a better place. Policy-makers, businesses, and the public use our data to make informed decisions.
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