Population by age by county in Illinois

Definitions: Number and Percentage of total population by age group of the population residing in respective Illinois geographic areas.  

Data Source: U.S. Census populations with bridged race categories from the National Center for Health Statistics. 

Data presented for 2010 through 2019 are Vintage 2019 population estimates. Each year the U.S. Census Bureau revises their post-2010 estimates. Therefore, data presented here may differ from previously published estimates. Figures for 1990, 2000, and 2010 represented revised population estimates for July 1, 1990, July 1, 2000, and July 1, 2010 - not actual Census counts from April 1, 1990, April 1, 2000, and April 1, 2010.

Footnotes: UPDATED - March 2022

Definitions: Number and Percentage of total population by age group of the population residing in respective Illinois geographic areas.  

Data Source: U.S. Census populations with bridged race categories from the National Center for Health Statistics. 

Data presented for 2010 through 2019 are Vintage 2019 population estimates. Each year the U.S. Census Bureau revises their post-2010 estimates. Therefore, data presented here may differ from previously published estimates. Figures for 1990, 2000, and 2010 represented revised population estimates for July 1, 1990, July 1, 2000, and July 1, 2010 - not actual Census counts from April 1, 1990, April 1, 2000, and April 1, 2010.

Footnotes: UPDATED - March 2022