DeKalb County, Illinois

DeKalb County, Illinois, had an estimated population of 101,835 in 2025 across 1,635 km². The figures below come from the US Census Bureau's population estimates and the American Community Survey, each shown with its own vintage and its rank among Illinois's counties and nationally.

Population: 101,835; 2025 estimate
Area: 1,635 km²
Density: 62; per km²
Median income: $70,724; household, ACS 2024
Median age: 32.7; years, ACS 2024

How Illinois's counties spread

Amenities & Infrastructure

Indicator	Value	In Illinois	In the US
Households with Broadband2024	92.7%	7 / 102	321 / 3,144
Median Gross Rent2024	$1,049	12 / 102	842 / 3,137
Median Home Value2024	$243,600	10 / 102	942 / 3,139
Owner-Occupied Homes2024	61.4%	98 / 102	2,872 / 3,144
Vacant Homes2024	5.1%	94 / 102	2,958 / 3,144

Demography

Indicator	Value	In Illinois	In the US
Aged 65 and Over2024	13.9%	100 / 102	2,911 / 3,144
American Indian & Alaska Native2024	0.2%	10 / 102	1,145 / 3,144
Asian, non-Hispanic2024	2.2%	16 / 102	464 / 3,144
Average Household Size2024people	2.4	30 / 102	1,582 / 3,144
Black, non-Hispanic2024	6.8%	24 / 102	940 / 3,144
Foreign-Born2024	6.4%	16 / 102	739 / 3,144
Hispanic or Latino2024	14.5%	11 / 102	610 / 3,144
Median Age2024years	32.7	100 / 102	3,012 / 3,144
Sex Ratio2024per 1,000 males	1,013	39 / 102	1,229 / 3,144
Speak a Language Other Than English2024	12.0%	14 / 102	757 / 3,144
Under 182024	21.6%	45 / 102	1,651 / 3,144
Veterans2024	5.2%	92 / 102	2,680 / 3,144
White, non-Hispanic2024	71.0%	86 / 102	2,008 / 3,144

Economy

Indicator	Value	In Illinois	In the US
Below Poverty Line2024	14.8%	26 / 102	1,220 / 3,144
Households on SNAP2024	14.7%	47 / 102	1,015 / 3,144
Income Inequality2024index	0.450	26 / 102	1,397 / 3,144
Median Household Income2024	$70,724	42 / 102	1,146 / 3,143
Per Capita Income2024	$36,298	55 / 102	1,377 / 3,144
Unemployment Rate2024	6.8%	11 / 102	403 / 3,144

Education

Indicator	Value	In Illinois	In the US
Bachelor's Degree or Higher2024	33.0%	15 / 102	564 / 3,144
High School or Higher2024	92.2%	43 / 102	1,011 / 3,144

Health Coverage

Indicator	Value	In Illinois	In the US
No Health Insurance2024	5.1%	49 / 102	2,483 / 3,144
With a Disability2024	11.1%	91 / 102	2,858 / 3,144

Population & Density

Indicator	Value	In Illinois	In the US
Population2025	101,835	19 / 102	615 / 3,144
Population Density2025/km²	62	18 / 102	664 / 3,144

Work & Commute

Indicator	Value	In Illinois	In the US
Commute by Public Transit2024	0.8%	20 / 102	511 / 3,144
Households with No Vehicle2024	6.4%	44 / 102	1,047 / 3,144
Mean Commute Time2024minutes	26.7	26 / 102	997 / 3,143
Work from Home2024	9.3%	35 / 102	1,378 / 3,144

Other counties of Illinois

Compare DeKalb County against every other county on a map, add layers and run a scatter — open the atlas. Sources and vintages for every figure on this page are listed under datasets, or browse all 3,144 counties.