DeKalb County Flag

DeKalb County

State:
Illinois
County Seat:
Clinton

DeKalb County's estimated 2025 population is 100,418 with a growth rate of 0.06% in the past year according to the most recent United States census data. DeKalb County is the 19th largest county in Illinois. The 2010 population was 105,151 and has seen a growth of -4.5% since that time.

100,418
Total Population
159
Population Density (mi²)
19
Population Rank (State)
65 0.06%
Annual Population Growth

DeKalb County Population

DeKalb County Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of DeKalb County includes 76.28% White, 7.78% Black or African American, 4.62% other race, and smaller percentages for Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

White

Two or more races

Black or African American

Other race

Asian

Native American

Native Hawaiian or Pacific Islander

Race
Population
Percentage (of total)
White76,67276.28%
Two or more races8,7728.73%
Black or African American7,8157.78%
Other race4,6434.62%
Asian2,1392.13%
Native American4400.44%
Native Hawaiian or Pacific Islander310.03%

DeKalb County Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

DeKalb County's average per capita income is $49,284. Household income levels show a median of $69,022. The poverty rate stands at 15.92%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.
Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.
Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.
Name
Median
Mean
Married Families$114,529$128,091
Families$93,970$107,783
Households$69,022$87,946
Non Families$38,165$52,745

$49,284

Average Income

$69,022

Median Household Income

15.92%

Poverty Rate