Counties in Illinois by median household income (US single-year estimate)
Kendall County had the highest median household income (US single-year estimate) of 102 counties in 2021, at $100,483. Alexander County had the lowest, at $41,816. The median was $58,764 and the figure for Illinois was $72,215. Source: the U.S. Census Bureau.
Map of counties, 2021
- Under 52K
- 52K to 56K
- 56K to 59K
- 59K to 64K
- 64K to 70K
- 70K and over
Top 40 counties, 2021
Full ranking
Other periods
About this ranking
Household income at the middle of the distribution for one year, in US dollars of that year. United States: Census Bureau Small Area Income and Poverty Estimates (SAIPE) for the nation, states and counties.
A model-based estimate that combines the one-year American Community Survey with federal tax records and other administrative data, so every county gets a figure for a single year. The national figure is the one-year ACS estimate. Not adjusted for inflation between years. The Census Bureau advises comparing years from 2006 on only. For the five-year ACS median, which also covers cities, use median_household_income.
Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.
How to cite
U.S. Census Bureau. Small Area Income and Poverty Estimates (SAIPE): median household income, nation, states and counties. https://www2.census.gov/programs-surveys/saipe/datasets/2021/2021-state-and-county/est21all.txt. Retrieved 2026-10-12.Citation styles
APA 7
U.S. Census Bureau. (2026). Small Area Income and Poverty Estimates (SAIPE): median household income, nation, states and counties (Counties in Illinois by median household income (US single-year estimate), 2021) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/saipe/datasets/2021/2021-state-and-county/est21all.txt
MLA 9
Small Area Income and Poverty Estimates (SAIPE): median household income, nation, states and counties, Counties in Illinois by median household income (US single-year estimate), 2021. U.S. Census Bureau, 27 Jan. 2026, https://www2.census.gov/programs-surveys/saipe/datasets/2021/2021-state-and-county/est21all.txt. Invokely, https://invokely.ai/rankings/median-household-income-single-year-us/illinois-counties?period=2021. Accessed 12 Oct. 2026.
Chicago (author-date)
U.S. Census Bureau. 2026. Small Area Income and Poverty Estimates (SAIPE): median household income, nation, states and counties. Counties in Illinois by median household income (US single-year estimate), 2021. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/saipe/datasets/2021/2021-state-and-county/est21all.txt. Also distributed by Invokely, https://invokely.ai/rankings/median-household-income-single-year-us/illinois-counties?period=2021.
Harvard
U.S. Census Bureau (2026) Small Area Income and Poverty Estimates (SAIPE): median household income, nation, states and counties, Counties in Illinois by median household income (US single-year estimate), 2021 [Dataset]. Available at: https://www2.census.gov/programs-surveys/saipe/datasets/2021/2021-state-and-county/est21all.txt, via Invokely: https://invokely.ai/rankings/median-household-income-single-year-us/illinois-counties?period=2021 (Accessed: 12 October 2026).
BibTeX
@misc{census_counties_in_illinois_by_2021,
author = {{U.S. Census Bureau}},
title = {{Small Area Income and Poverty Estimates (SAIPE): median household income, nation, states and counties: Counties in Illinois by median household income (US single-year estimate), 2021}},
year = {2026},
howpublished = {Data set},
url = {https://www2.census.gov/programs-surveys/saipe/datasets/2021/2021-state-and-county/est21all.txt},
urldate = {2026-10-12},
note = {Accessed via Invokely, https://invokely.ai/rankings/median-household-income-single-year-us/illinois-counties?period=2021. Publisher attribution: U.S. Census Bureau. Small Area Income and Poverty Estimates (SAIPE): median household income, nation, states and counties. https://www2.census.gov/programs-surveys/saipe/datasets/2021/2021-state-and-county/est21all.txt. Retrieved 2026-10-12.},
}
RIS
TY - DATA
AU - U.S. Census Bureau
TI - Small Area Income and Poverty Estimates (SAIPE): median household income, nation, states and counties: Counties in Illinois by median household income (US single-year estimate), 2021
PY - 2026
DA - 2026/01/27
PB - U.S. Census Bureau
DB - Invokely
UR - https://www2.census.gov/programs-surveys/saipe/datasets/2021/2021-state-and-county/est21all.txt
L2 - https://invokely.ai/rankings/median-household-income-single-year-us/illinois-counties?period=2021
Y2 - 2026/10/12
N1 - Accessed via Invokely, https://invokely.ai/rankings/median-household-income-single-year-us/illinois-counties?period=2021.
N1 - Publisher attribution: U.S. Census Bureau. Small Area Income and Poverty Estimates (SAIPE): median household income, nation, states and counties. https://www2.census.gov/programs-surveys/saipe/datasets/2021/2021-state-and-county/est21all.txt. Retrieved 2026-10-12.
ER -
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:
Rank Counties in Illinois by median household income (US single-year estimate) using official data, and cite the source.
rank_places {"indicator":"median_household_income_saipe","level":"province","within":"Illinois","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=median_household_income_saipe&level=province&within=Illinois&limit=10Questions
Which county has the highest median household income (US single-year estimate)?
Kendall County, with $100,483 in 2021, according to the U.S. Census Bureau.
Which county has the lowest median household income (US single-year estimate)?
Alexander County, with $41,816 in 2021.
Where does this ranking come from?
Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Small Area Income and Poverty Estimates (SAIPE): median household income, nation, states and counties. Retrieved 2026-10-12.