Cortland

County:: DeKalb County
County Seat:: No
Area (mi²):: 3.593
State:: Illinois

Cortland is a town located in DeKalb County, Illinois. Cortland has a 2025 population of 4,548. Cortland is currently growing at a rate of 0.66% annually and its population has increased by 3.43% since the most recent census, which recorded a population of 4,397 in 2020.

The average household income in Cortland is $104,922 with a poverty rate of 7.96%. The median age in Cortland is 31.9 years: 27.5 years for males, and 37.3 years for females.

Demographics

The racial composition of Cortland includes 75.4% White, 9.88% Black or African American, 4.26% other race, and smaller percentages for Native American, Asian, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

White

Two or more races

Black or African American

Other race

Native American

Asian

Native Hawaiian or Pacific Islander

Race	Population	Percentage (of total)
White	3,435	75.4%
Two or more races	477	10.47%
Black or African American	450	9.88%
Other race	194	4.26%
Native American	0	0%
Asian	0	0%
Native Hawaiian or Pacific Islander	0	0%

Cortland Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Cortland's average per capita income is $44,444. Household income levels show a median of $82,750. The poverty rate stands at 7.96%.

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	$104,612	-
Families	$101,250	$109,344
Households	$82,750	$104,922
Non Families	$68,193	$75,900

$44,444

Average Income

$82,750

Median Household Income

7.96%

Poverty Rate