COUNTY · 1990 CENSUS
DeKalb County
Illinois · 77,932 residents · 631.337 sq mi
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The short version
DeKalb County has roughly average household income, with a median household income of $30,864. Population has declined 12% since 2000. Median home value is $80,900. At a median age of 27.3, residents skew younger than the country as a whole.
At a glance
Average income
near the US median
US median: $30,130
Younger
median age 27.3
US median: 33.0
More educated
26% hold a bachelor's degree
US average: 20%
More affordable
home values down 20%, inflation adjusted
US median home: $93,722
Section 01
Population & growth
Population, 1990 – 2024
2024101K
Age distribution, 1990
Under 56.3%(4,895)
5 to 96.6%(5,163)
10 to 145.4%(4,199)
15 to 1911.1%(8,662)
20 to 2416.9%(13,196)
25 to 3415.7%(12,226)
35 to 4412.6%(9,810)
45 to 548.5%(6,589)
55 to 646.7%(5,199)
65 to 745.7%(4,468)
75 to 843.4%(2,653)
85 and over1.1%(872)
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Section 02
Income & economy
$30,864
−11%inflation adjusted, since 2000
vs $45,828 in 2000
US average: $30,130
1990 – 2024
Section 03
Housing
$80,900
−20%inflation adjusted, since 2000
vs $133,900 in 2000
US average: $93,722
1990 – 2024
RELATED:See current rent listings in DeKalb County on RentDataNow
Section 04
Race & ethnicity
2000
White, non-Hispanic85.2%(75,772)
Black4.5%(4,040)
Hispanic / Latino6.6%(5,830)
Asian2.3%(2,067)
Other0%
1990
White, non-Hispanic93.3%(72,712)
Black2.9%(2,238)
Hispanic / Latino2.6%(2,033)
Asian2.3%(1,823)
Other1.5%(1,159)
No data for the years selected.
Section 04 · Origins
Detailed origins & ancestry
Detailed origin tables are available for 2024; showing 2024 data.
Hispanic origin
Mexican11.5%(11,610)
Puerto Rican1.5%(1,514)
South American0.5%(468)
Central American0.4%(366)
Colombian0.3%(271)
Honduran0.2%(189)
Chilean0.2%(152)
Spaniard0.1%(137)
Cuban0.1%(128)
Guatemalan0.1%(128)
Venezuelan0%(33)
Salvadoran0%(30)
+ 3 more hispanic origin groups with data
Asian origin
Filipino0.6%(585)
Asian Indian0.5%(467)
Chinese0.4%(387)
Korean0.2%(172)
Vietnamese0.2%(171)
Nepalese0.1%(131)
Laotian0.1%(75)
Pakistani0%(36)
Uzbek0%(32)
Thai0%(28)
Bangladeshi0%(25)
Japanese0%(24)
Ancestry
German23.7%(23,824)
Irish15.2%(15,331)
English8.9%(9,012)
Italian6.5%(6,570)
Polish5.7%(5,751)
Swedish4.1%(4,136)
Norwegian4%(3,978)
American3.4%(3,408)
French2.4%(2,401)
Scottish1.6%(1,651)
Dutch1%(1,028)
Czech0.9%(924)
+ 43 more ancestry groups with data
Scotch-Irish0.6%(635)
Subsaharan African0.6%(635)
Hungarian0.6%(564)
Ukrainian0.5%(530)
Greek0.4%(445)
Romanian0.4%(443)
Welsh0.4%(405)
Lithuanian0.4%(400)
Slovak0.4%(389)
Arab0.3%(268)
French Canadian0.3%(268)
Russian0.3%(266)
Austrian0.2%(251)
Danish0.2%(231)
Finnish0.2%(215)
British0.2%(210)
Swiss0.2%(208)
Belgian0.2%(154)
Nigerian0.1%(132)
Serbian0.1%(125)
West Indian0.1%(123)
Canadian0.1%(103)
Somali0.1%(75)
Croatian0.1%(73)
Slovene0.1%(57)
Jordanian0%(48)
Ghanaian0%(48)
Australian0%(45)
Armenian0%(40)
Turkish0%(36)
Jamaican0%(34)
Haitian0%(33)
Cape Verdean0%(32)
Iranian0%(27)
Latvian0%(25)
Lebanese0%(24)
Portuguese0%(19)
Palestinian0%(15)
Ethiopian0%(13)
Egyptian0%(7)
Brazilian0%(7)
Bulgarian0%(2)
Israeli0%(2)
Section 05
Education
High school or higher
83.9%
−3.6 ptsvs 2000
vs 87.5% in 2000
US average: 75.2%
Section 06
Commute & transportation
Section 07
Work & employment
No data for the years selected.
Section 08
People & community
No data for the years selected.
Marital status (2024)
Men 15+
Never married44.1%(18,054)
Married45.5%(18,630)
Widowed1.8%(751)
Divorced8.6%(3,515)
Women 15+
Never married40.4%(16,894)
Married41.2%(17,245)
Widowed7.3%(3,042)
Divorced11.1%(4,642)
SHARE WITHIN EACH SEX · POPULATION 15 AND OVER · 2024
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Compare DeKalb County to nearby counties
DEKALB COUNTY VS
Kane County
Income$103,163+234%
Home value$327,000+304%
Population525,757+416%
SEE FULL COMPARISON →
DEKALB COUNTY VS
Kendall County
Income$111,601+262%
Home value$322,400+299%
Population145,470+43%
SEE FULL COMPARISON →
DEKALB COUNTY VS
Lee County
Income$70,292+128%
Home value$154,600+91%
Population32,914−68%
SEE FULL COMPARISON →
DEKALB COUNTY VS
Boone County
Income$84,571+174%
Home value$216,900+168%
Population53,568−47%
SEE FULL COMPARISON →
Frequently asked
How many people live in DeKalb County, Illinois?
DeKalb County, Illinois has about 77,932 residents according to the 1990 Census.
What is the median household income in DeKalb County, Illinois?
The typical household in DeKalb County, Illinois earns about $30,864 a year. Half of households make more than that, and half make less.
Is DeKalb County, Illinois expensive?
In DeKalb County, Illinois, the median home is worth about $80,900, and the typical rent is about $424 a month.
How educated are people in DeKalb County, Illinois?
About 26.1% of adults age 25 and over in DeKalb County, Illinois hold a bachelor's degree or higher.
What is the poverty rate in DeKalb County, Illinois?
About 13.5% of people in DeKalb County, Illinois live below the federal poverty line.
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23 census tracts (top 20 by population)
Census Tract 1Census Tract 8Census Tract 10.02Census Tract 14Census Tract 6Census Tract 9Census Tract 13Census Tract 2Census Tract 20Census Tract 4.02Census Tract 16Census Tract 4.01Census Tract 10.03Census Tract 15Census Tract 5Census Tract 7Census Tract 22Census Tract 18Census Tract 17Census Tract 313 ZIP codes
ZIP 60115ZIP 60178ZIP 60548ZIP 60135ZIP 60112ZIP 60552ZIP 60520ZIP 60145ZIP 60146ZIP 60556ZIP 60150ZIP 60550ZIP 60111Up the hierarchy
All counties in IllinoisDATA: US CENSUS BUREAU ACS 5-YEAR + DECENNIAL CENSUS · UPDATED 2024