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 and multiracial populations.

Population by Race

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%

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