Cortland Flag

Cortland

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

Cortland is located in DeKalb County, Illinois. Cortland has a 2025 population of 11,612 . Cortland is currently growing at a rate of 1.12% annually and its population has increased by 3.84% since the most recent census, which recorded a population of 11,183 in 2020.

The average household income in Cortland is $110,904 with a poverty rate of 6.49%. The median age in Cortland is 35.6 years: 32.2 years for males, and 37.9 years for females. For every 100 females there are 109.7 males.

11.6K
Total Population
332
Density (mi²)
129 1.12%
Growth

Cortland Population

Cortland Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of Cortland includes 83.63% White, 6.96% Black or African American, and smaller percentages for other race, Asian and multiracial populations.

Population by Race

White (83.63%)

Two or more races (7.29%)

Black or African American (6.96%)

Other race (1.97%)

Asian (0.15%)

Race
Population
Percentage (of total)
White9,42183.63%
Two or more races8217.29%
Black or African American7846.96%
Other race2221.97%
Asian170.15%

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 $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

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)