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 2026 population of 4,690. Cortland is currently growing at a rate of 1.06% annually and its population has increased by 6.69% since the most recent census, which recorded a population of 4,396 in 2020.

The median household income in Cortland is $73,971 with a poverty rate of 7.01%. The median age in Cortland is 31.5 years: 27.8 years for males, and 37.2 years for females. For every 100 females there are 118.4 males.

4.7K
Total Population
1,305
Density (mi²)
49 1.06%
Growth

Cortland Population

Cortland Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
20264,690491.06%
20254,641491.07%
20244,592922.04%
20234,500481.08%
20224,452410.93%
20214,411150.34%
20204,396-5-0.11%
20194,418360.82%
20184,382400.92%
20174,34280.18%
20164,334-3-0.07%
20154,337-3-0.07%
20144,340180.42%
20134,32220.05%
20124,320340.79%
20114,286160.37%
20104,296250.59%

Median Age

Overall: 31.5 years
Female: 37.2 years
Male: 27.8 years

Cortland Adults

There are 3,241 adults, (360 of whom are seniors) in Cortland.

Sex Ratio

Female: 2,090 (45.8%)
Male: 2,474 (54.2%)

Demographics

The racial composition of Cortland includes 72.02% White, 6.77% Black or African American, 5.26% other race, and smaller percentages for Asian and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White3,28772.02%
Two or more races69615.25%
Black or African American3096.77%
Other race2405.26%
Asian320.7%
Race
Population ↓
Percentage (of total)
Two or more races3748.19%
Other race2405.26%
White932.04%
Black or African American761.67%
Race
Population ↓
Percentage (of total)
White3,19469.98%
Two or more races3227.06%
Black or African American2335.11%
Asian320.7%

Cortland Marital Status

Economics and Income Statistics

Cortland 's average per capita income is $50,844. Household income levels show a median of $73,971. The poverty rate stands at 7.01%.

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$112,941-
Families$84,792$102,690
Households$73,971$96,071
Non Families$32,365$51,788

$50,844

Average Income

$73,971

Median Household Income

7.01%

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)