Data / Population / Iroquois County

Population in Iroquois County

Population in Iroquois County was 26,150 in 2025, according to the U.S. Census Bureau. That is down 0.3% from 2024. That is the 50th highest of 102 counties in 2025.

2025, persons26,150
Change on 2024-0.3%
Rank50th of 102Counties in Illinois ranked
Series high26,9672020
Series low26,1352023

Population in Iroquois County, 2020 to 2025

CSVChart (SVG)

26K26.2K26.4K26.6K26.8K27K2020202120222023202420252020: 26,967 persons2021: 26,770 persons2022: 26,421 persons2023: 26,135 persons2024: 26,222 persons2025: 26,150 persons
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08, published 2026-03-26.
All 6 values
Periodpersons
202526,150
202426,222
202326,135
202226,421
202126,770
202026,967

Compared with Illinois and United States

Place2025
Iroquois County26,150
Illinois12,719,141
United States341,784,857

Rankings

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. Other countries and the World: World Bank mid-year estimates, which count all residents regardless of legal status or citizenship.

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. The World Bank series exists for every country, so use it (through compare) to rank countries on one basis.

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.

Use this data in your AI agent

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

What is the latest population in Iroquois County? Cite the source.
get_value {"indicator":"population","place":"us-county-17075"}
GET https://invokely.ai/api/v1/value?indicator=population&place=us-county-17075

Connect Claude, ChatGPT or Cursor in one step. The trial answers 25 calls a day without an account.

Questions

What is the population in Iroquois County?

Population in Iroquois County was 26,150 in 2025, according to the U.S. Census Bureau. That is down 0.3% from 2024. That is the 50th highest of 102 counties in 2025.

Where does this figure come from?

U.S. Census Bureau. Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). Retrieved by Invokely on 2026-10-08.

What was the highest population in Iroquois County?

26,967 in 2020, the highest value since 2020 in this series.

More statistics for Iroquois County

All statistics for Iroquois County