Cortland township

County:: DeKalb County
County Seat:: No
Area (mi²):: 35.029
State:: Illinois

Cortland township is located in DeKalb County, Illinois. Cortland township has a 2025 population of 11,426. Cortland township is currently growing at a rate of 0.43% annually and its population has increased by 2.13% since the most recent census, which recorded a population of 11,188 in 2020.

The average household income in Cortland township is $110,904 with a poverty rate of 6.49%. The median age in Cortland township is 35.6 years: 32.2 years for males, and 37.9 years for females.

Demographics

The racial composition of Cortland township includes 83.63% White, 6.96% Black or African American, and smaller percentages for other race, 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)
White	9,421	83.63%
Two or more races	821	7.29%
Black or African American	784	6.96%
Other race	222	1.97%
Asian	17	0.15%
Native American	0	0%
Native Hawaiian or Pacific Islander	0	0%

Cortland township Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Cortland township's average per capita income is $54,183. Household income levels show a median of $96,500. The poverty rate stands at 6.49%.

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	$119,401	-
Families	$110,844	$120,121
Households	$96,500	$110,904
Non Families	$63,281	$67,194

$54,183

Average Income

$96,500

Median Household Income

6.49%

Poverty Rate