United States › Illinois › Jefferson County COUNTY · 2000 CENSUS
Jefferson County Illinois · 40,045 residents · 571 sq mi
Time machine
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The short version
Jefferson County is home to 40,045 people in Illinois. About 14% of adults have finished a four-year degree. The typical home is worth $60,000. That trails the Illinois median by roughly 28%. Owners hold 75% of the housing stock. Median rent is $392 a month.
At a glance
Lower income
below the US median
US median: $42,589
Older
median age 37.6
US median: 35.2
Less educated
14% hold a bachelor's degree
US average: 24%
Stable housing
home values roughly flat, inflation adjusted
US median home: $120,530
Section 01
Population & growth from 34.9 in 1990
US average: 35.2
Population, 1990 – 2024
36K 37K 38K 39K 40K 1990 2000 2010 2020 2024 Jefferson County Age distribution, 2000
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Section 02
Income & economy $33,555
+14%inflation adjusted, since 1990
from $22,397 in 1990
US average: $42,589
from $11,279 in 1990
US average: $21,522
from 16.1% in 1990
US average: 12.4%
$60,000
+9%inflation adjusted, since 1990
from $41,700 in 1990
US average: $120,530
$392
−1%inflation adjusted, since 1990
from $300 in 1990
US average: $602
from 73.0% in 1990
25.4% rent
Section 04
Race & ethnicity 1990
White, non-Hispanic 93.8%(34,741)
Hispanic / Latino 0.8%(306)
2000
White, non-Hispanic 89.2%(35,709)
Hispanic / Latino 1.3%(531)
No data for the years selected.
Section 04 · Origins
Detailed origins & ancestry Detailed origin tables are available for 2024; showing 2024 data.
Ancestry
+ 30 more ancestry groups with data from 11.3% in 1990
US average: 24.4%
High school or higher
from 69.9% in 1990
US average: 80.3%
from 3.7% in 1990
US average: 8.8%
Section 06
Commute & transportation from 18.0 min in 1990
US average: 17.6
Section 07
Work & employment No data for the years selected.
Section 08
People & community No data for the years selected.
Marital status
Men 15+
Never married 20.3%(3,316)
Women 15+
Never married 16.3%(2,548)
SHARE WITHIN EACH SEX · POPULATION 15 AND OVER · 2000
Section 09
Health coverage Showing 2024 (the nearest year with coverage data).
from 12.1% in 2013
US average: 8.4%
from 50.4% in 2020
US average: 54.8%
Direct-purchase
from 13.3% in 2020
US average: 13.8%
from 22.1% in 2020
US average: 18.4%
from 27.2% in 2020
US average: 20.9%
VA health care
from 3.7% in 2020
US average: 2.2%
Any private
from 63.6% in 2020
US average: 67.1%
Any public
from 46.5% in 2020
US average: 36.7%
Shares are "alone or in combination": a person with both Medicare and Medicaid counts in each, so categories overlap and do not sum to 100%.
Section 09 · Service history
Veterans Veterans by period of service, 2024
Gulf War (2001 or later) 22.6%(497)
Gulf War (1990s) 21.4%(469)
Share of the 2,196 veterans here. A veteran who served across eras counts in each, so shares can total more than 100%. Peacetime-only service is included in the total but not shown as an era.
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Drill deeper
Places similar to Jefferson County Head to head
Compare Jefferson County to nearby counties JEFFERSON COUNTY VS
Franklin County
Income $56,740 +69%
Home value $89,000 +48%
Population 36,916 +2%
SEE FULL COMPARISON →
JEFFERSON COUNTY VS
Marion County
Income $61,240 +83%
Home value $103,000 +72%
Population 36,382 +1%
SEE FULL COMPARISON →
JEFFERSON COUNTY VS
Hamilton County
Income $65,746 +96%
Home value $113,700 +90%
Population 7,859 −78%
SEE FULL COMPARISON →
JEFFERSON COUNTY VS
Washington County
Income $78,224 +133%
Home value $155,700 +160%
Population 13,564 −62%
SEE FULL COMPARISON →
Frequently asked
How many people live in Jefferson County, Illinois? Jefferson County, Illinois has about 40,045 residents according to the 2000 Census.
What is the median household income in Jefferson County, Illinois? The typical household in Jefferson County, Illinois earns about $33,555 a year. Half of households make more than that, and half make less.
Is Jefferson County, Illinois expensive? In Jefferson County, Illinois, the median home is worth about $60,000, and the typical rent is about $392 a month.
How educated are people in Jefferson County, Illinois? About 13.7% of adults age 25 and over in Jefferson County, Illinois hold a bachelor's degree or higher.
What is the poverty rate in Jefferson County, Illinois? About 12.3% of people in Jefferson County, Illinois live below the federal poverty line.
Has Jefferson County, Illinois grown since 1990? Yes, Jefferson County, Illinois has grown since 1990. The population has added about 3,025 residents, a change of about 8 percent over that period.
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