Data / Population / Illinois

Population: Illinois

Latest value, 2025

12,719,141persons

Source: U.S. Census Bureau
Retrieved 2026-10-08
Published 2026-03-26

Definition

Resident population. Spain and the EU: 1 January, with Spanish figures from the official municipal register (Padrón). United States: Census Bureau population estimates for 1 July.

For Denmark, Statistics Denmark counts the registered resident population on 1 January. Greenland and the Faroe Islands are excluded. The annual series selects the first-quarter reference date from FOLK1A.

Evolution

12,616,26512,702,46312,788,660202020212022202320242025
Value
PeriodValue
202512,719,141
202412,703,033
202312,633,389
202212,609,577
202112,703,354
202012,795,348

Comparison with related places

Place2025
Illinois12,719,141
United States341,784,857
Pennsylvania13,059,432
Ohio11,900,510
Georgia11,302,748
North Carolina11,197,968
Michigan10,127,884

How to cite

U.S. Census Bureau. Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-08.

Get this figure from your agent

Call get_value through the MCP server or the REST API.

get_value {"indicator":"population","place":"us-state-17"}
GET https://invokely.ai/api/v1/value?indicator=population&place=us-state-17

Other indicators for Illinois

Statistics for Illinois