Town in DeKalb County, Illinois
Cortland
Who lives in Cortland
Census survey estimates for 2020 to 2024, rounded.
People
- Population
- 4,600
- Median age
- 31.5 years
- Under 18
- 29%
- 65 and over
- 8%
- Veterans, of adults
- 3%
- Speak another language at home
- 10%
Race and ethnicity
- Hispanic or Latino, of any race
- 17%
- White, not Hispanic
- 70%
- Black, not Hispanic
- 5%
- Asian, not Hispanic
- 1%
Income and housing
- Median household income
- $74,000
- Below the poverty line
- 7%
- Bachelor's or higher, adults 25+
- 27%
- Owner-occupied homes
- 78%
- Median home value
- $233,000
2024 vote for president
Not counted for Cortland on its own: its precincts follow township lines, not the town’s. See the figure for DeKalb County.
Who represents Cortland
Cortland's districts
U.S. House District 14
All of Cortland
Held by Lauren Underwood, Democratic
- Washington office: (202) 225-2976
About 763,800 people, median household income $95,500.
Largest towns: Joliet (part), Aurora (part), Plainfield and 77 more
Illinois Senate District 35
All of Cortland
Held by Dave Syverson, Republican
- Springfield office: (217) 782-5413
- District office: (815) 987-7555
About 217,000 people, median household income $109,700.
Largest towns: Huntley, Sycamore (part), Lake in the Hills (part) and 51 more
Illinois House District 70
All of Cortland
Held by Jeff Keicher, Republican
- Springfield office: (217) 782-0425
- District office: (815) 748-3494
About 109,400 people, median household income $115,800.
Largest towns: Sycamore (part), Pingree Grove (part), Sugar Grove (part) and 21 more
Source: U.S. Census Bureau, American Community Survey 5-year estimates, 2020–2024; towns and counties from the 2020 Census, 119th Congressional District and 2024 state legislative district tabulation. Figures rounded by us. Retrieved 2026-10-19. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.
Source: U.S. Census Bureau, American Community Survey 5-year estimates, 2020–2024; towns and counties from the 2020 Census, 119th Congressional District and 2024 state legislative district tabulation. Figures rounded by us. Retrieved 2026-10-19. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.