Cortland Flag

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 4,641 . Cortland is currently growing at a rate of 1.07% annually and its population has increased by 5.57% since the most recent census, which recorded a population of 4,396 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. For every 100 females there are 143.8 males.

4.6K
Total Population
1,292
Density (mi²)
49 1.07%
Growth

Cortland Population

Cortland Population

Data after 2023 is projected based on recent change

Demographics

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

Population by Race

White (75.4%)

Two or more races (10.47%)

Black or African American (9.88%)

Other race (4.26%)

Race
Population
Percentage (of total)
White3,43575.4%
Two or more races47710.47%
Black or African American4509.88%
Other race1944.26%

Cortland Marital Status

OverallMalesFemales0%10%20%30%40%50%60%70%80%90%100%

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

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)