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COUNTY · 1990 CENSUS

Johnson County

Illinois · 11,347 residents · 343.736 sq mi
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The short version

Johnson County has notably lower household income than the US average, with a median household income of $21,953. Population has declined 12% since 2000. 9% of adults hold a bachelor's degree or higher, below the national rate of 20%. Median home value is $36,300. Households here earn about 32% less than the Illinois median.

At a glance
Lower income
below the US median
US median: $30,130
Older
median age 35.5
US median: 33.0
Less educated
9% hold a bachelor's degree
US average: 20%
More affordable
home values down 25%, inflation adjusted
US median home: $93,722
Section 01

Population & growth

11,347
−12%vs 2000
vs 12,878 in 2000
1990 – 2025
33 / sq mi
−12%vs 2000
vs 37 / sq mi in 2000
US average: 221
35.5
−3%vs 2000
vs 36.7 in 2000
US average: 33.0
Population, 19902024
11K12K13K13K14K1990201020202024Johnson County
202413K
1990201020202024
Section 02

Income & economy

$21,953
−13%inflation adjusted, since 2000
vs $33,326 in 2000
US average: $30,130
1990 – 2024
$9,170
−49%vs 2000
vs $17,990 in 2000
US average: $14,340
15.6%
+4.2 ptsvs 2000
vs 11.3% in 2000
US average: 13.2%
Section 03

Housing

$36,300
−25%inflation adjusted, since 2000
vs $63,400 in 2000
US average: $93,722
1990 – 2024
$235
−12%inflation adjusted, since 2000
vs $351 in 2000
US average: $450
81.7%
−3.0 ptsvs 2000
vs 84.7% in 2000
18.3% rent
1.7
−13%vs 2000
vs 1.9 in 2000
1990 – 2024
RELATED:See current rent listings in Johnson County on RentDataNow
Section 04

Race & ethnicity

2000
White, non-Hispanic81.9%(10,553)
Black14.1%(1,821)
Hispanic / Latino2.9%(368)
Asian0.1%(17)
Other0%
Diversity Score36.8%(4,744)
1990
White, non-Hispanic90%(10,211)
Black9.3%(1,051)
Hispanic / Latino2.2%(249)
Asian0%(0)
Other0.7%(85)
Diversity Score27%(3,062)
27
−27%vs 2000
vs 37 in 2000
1990 – 2024
Section 05

Education

9.1%
−2.6 ptsvs 2000
vs 11.7% in 2000
US average: 20.3%
High school or higher
66.2%
−0.9 ptsvs 2000
vs 67.1% in 2000
US average: 75.2%
3.4%
−0.9 ptsvs 2000
vs 4.4% in 2000
US average: 7.1%
Section 06

Commute & transportation

23.3 min
+19%vs 2000
vs 19.7 min in 2000
US average: 21.9
Section 07

Work & employment

No data for the years selected.

Section 08

People & community

No data for the years selected.

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Frequently asked

How many people live in Johnson County, Illinois?

Johnson County, Illinois has about 11,347 residents according to the 1990 Census.

What is the median household income in Johnson County, Illinois?

The typical household in Johnson County, Illinois earns about $21,953 a year. Half of households make more than that, and half make less.

Is Johnson County, Illinois expensive?

In Johnson County, Illinois, the median home is worth about $36,300, and the typical rent is about $235 a month.

How educated are people in Johnson County, Illinois?

About 9.1% of adults age 25 and over in Johnson County, Illinois hold a bachelor's degree or higher.

What is the poverty rate in Johnson County, Illinois?

About 15.6% of people in Johnson County, Illinois live below the federal poverty line.

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DATA: US CENSUS BUREAU ACS 5-YEAR + DECENNIAL CENSUS · UPDATED 2024

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