Observations

2025: 12,719.141

Updated: Mar 3, 2026 5:41 PM CST

Units:

Thousands of Persons,

Not Seasonally Adjusted

Frequency:

Annual

Notes

Title	Release Dates

Resident Population in Illinois	2004-12-22	2026-01-27

Source

U.S. Census Bureau	2004-12-22	2026-01-27

Release

Annual Estimates of the Population for the U.S. and States, and for Puerto Rico	2004-12-22	2026-01-27

Units

Thousands of Persons	2004-12-22	2026-01-27

Frequency

Annual	2004-12-22	2026-01-27

Seasonal Adjustment

Not Seasonally Adjusted	2004-12-22	2026-01-27

Notes

Data for "Resident Population" from 1901 to present are July 1 estimates of each year.	2004-12-22	2026-01-27

Release Tables

Annual Estimates of the Population for the U.S. and States, and for Puerto Rico