Cortland, Illinois
Population, housing costs, incomes, jobs, commuting and climate in Cortland, compared with Illinois and the U.S. using Census records and their margins of error.
Cortland town · Incorporated town · Census GEOID 1716470 · Illinois directory
- Population · July 1, 2025
- 4,676 PEP Vintage 2025
- Change · 2024 to 2025
- +2.4% +111 residents
- Household income
- $73,971 ACS 2020–2024 · ±$18,270
- Home value
- $233,200 ACS 2020–2024 · ±$21,922
- Monthly gross rent
- $1,552 ACS 2020–2024 · ±$364
- Median age
- 31.5 years ACS 2020–2024 · ±3.4
Cortland is an incorporated town in DeKalb County, Illinois, part of the Chicago-Naperville-Elgin, IL-IN metropolitan area. With 4,676 residents on July 1, 2025, it ranks 342nd in Illinois and 5,091st nationally among Census places. Its population grew by 111 (2.4%) in the year to July 2025; since April 2020 it has grown 6.2%. Median gross rent in the 2020–2024 survey is $1,552 a month, 21.8% above the Illinois median. Median household income is $73,971, 11.3% below the Illinois median.
Detailed demographics → Housing and cost-of-living context →
What stands out in Cortland?
Compared with other Illinois places, Cortland is most distinctive for a larger share of cost-burdened renters, faster population growth and a younger population. Each statement below uses reliable estimates only, and survey differences from the state exceed their combined 90% margin of error.
- Renters paying 30%+ of income on rent: 78.0%, 30.1 percentage points above the Illinois rate (47.9%); higher than 97% of 471 Illinois places with reliable estimates.
- Population change since April 2020: +6.2%; higher than 97% of 1,233 Illinois places with reliable estimates.
- Median age: 31.5 years, 7.5 years younger than the Illinois median (39.0 years); lower than 95% of 1,239 Illinois places with reliable estimates.
- Median real estate taxes paid: $6,624, 25.0% above the Illinois median ($5,298); higher than 90% of 1,101 Illinois places with reliable estimates.
- Households with a broadband subscription: 95.3%, 4.6 percentage points above the Illinois rate (90.8%); higher than 87% of 1,256 Illinois places with reliable estimates.
How Cortland compares with Illinois and the U.S.
| Measure | Cortland | Illinois | U.S. | Position in Illinois |
|---|---|---|---|---|
| Population change since April 2020 PEP Vintage 2025 | +6.2% | — | — | higher than 97% of 1,233 Illinois places |
| Residents per square mile of land PEP 2025 / Gazetteer 2025 | 1,292 | — | — | higher than 62% of 1,293 Illinois places |
| Median household income B19013 | $73,971 ±$18,270 | $83,390 | $80,734 | higher than 58% of 1,150 Illinois places |
| Median home value B25077 | $233,200 ±$21,922 | $263,300 | $332,700 | higher than 78% of 1,202 Illinois places |
| Median real estate taxes paid B25103 | $6,624 ±$515 | $5,298 | $3,119 | higher than 90% of 1,101 Illinois places |
| Median gross rent B25064 | $1,552 ±$364 | $1,274 | $1,413 | higher than 89% of 996 Illinois places |
| Renters paying 30%+ of income on rent B25070 | 78.0% ±20.4 pp | 47.9% | 51.1% | higher than 97% of 471 Illinois places |
| Homeownership rate B25003 | 78.0% ±7.3 pp | 67.1% | 65.2% | lower than 52% of 1,244 Illinois places |
| Median age B01002 | 31.5 years ±3.4 | 39.0 years | 38.9 years | lower than 95% of 1,239 Illinois places |
| Adults 25+ with a bachelor’s degree or higher B15003 | 26.7% ±6.5 pp | 37.8% | 35.7% | higher than 59% of 803 Illinois places |
| Poverty rate B17001 | 7.0% ±4.9 pp · low precision | 11.8% | 12.5% | Not ranked: low precision |
| People without health insurance B27010 | 7.6% ±3.3 pp | 6.9% | 8.4% | higher than 64% of 330 Illinois places |
| Households with a broadband subscription B28002 | 95.3% ±3.5 pp | 90.8% | 91.0% | higher than 87% of 1,256 Illinois places |
| Unemployment rate (civilian labor force) B23025 | 8.2% ±6.0 pp · low precision | 5.8% | 5.2% | Not ranked: low precision |
| Foreign-born residents B05002 | 4.3% ±2.3 pp · low precision | 14.7% | 14.1% | Not ranked: low precision |
| Jobs located in the place per 100 residents LODES 8.4 / PEP | 23.6 | — | — | lower than 69% of 757 Illinois places |
| Change in local jobs since 2019 LODES 8.4 | -11.5% | — | — | lower than 81% of 630 Illinois places |
| Workers who work from home B08301 | 9.6% ±3.7 pp | 15.9% | 15.1% | lower than 76% of 396 Illinois places |
| Commutes of 45 minutes or longer B08303 | 19.7% ±6.0 pp | 19.7% | 16.5% | higher than 52% of 669 Illinois places |
| Households without a vehicle B08201 | 2.8% ±2.6 pp · low precision | 11.0% | 8.4% | Not ranked: low precision |
Positions compare Cortland with Illinois places in this directory whose estimate has a coefficient of variation of 30% or less (survey measures) or a published PEP value. The marker runs from the lowest value (left) to the highest (right); it is a description, not a score or a recommendation. 4 measures are shown in grey because the survey margin of error is too wide to rank reliably.
How many people live in Cortland?
The latest official estimate is 4,676 residents on July 1, 2025. It ranks 5,091st by population nationally and 342nd in Illinois among this directory’s PEP places. Population changed by 111 residents between the 2024 and 2025 estimates. These are annual estimates, not census enumerations.
| Reference date | Population | Change from previous estimate |
|---|---|---|
| July 1, 2020 | 4,396 | Separate from April 2020 base |
| July 1, 2021 | 4,411 | +15 |
| July 1, 2022 | 4,444 | +33 |
| July 1, 2023 | 4,484 | +40 |
| July 1, 2024 | 4,565 | +81 |
| July 1, 2025 | 4,676 | +111 |
From the revised April 2020 base to July 2025, the change is +274 residents (6.2%). This is a within-vintage comparison. Boundary adjustments can affect both the estimates and their interpretation.
Download this population chart (SVG) · Official population release
Where are the boundaries?
- Entity and stable identifier
- Cortland town, Illinois · Incorporated town · 1716470
- Counties or equivalents · 2025 boundaries
- DeKalb County
- Metropolitan or micropolitan context · July 2023 delineations
- Chicago-Naperville-Elgin, IL-IN — Metropolitan Statistical Area County associations use Census PEP county place parts. Each county is matched by FIPS code to the official CBSA list; a city can span several counties or statistical areas. A missing association can reflect an area outside a CBSA or changed county codes between vintages. City figures on this page remain place-level statistics.
- Land area
- 3.6 square miles · 2025 Gazetteer
- Water area
- 0.0 square miles · 2025 Gazetteer
- Approximate population density
- 1,292 residents per square mile of land
- Internal point
- 41.937239°, -88.689303° · Census geographic reference point
Density divides the July 2025 estimate by 2025 Gazetteer land area, so it is approximate. The internal point is a locator, not an address. Census place profile reference .
Income and poverty
| Measure / survey universe | City estimate ± MOE | State estimate ± MOE | U.S. estimate ± MOE |
|---|---|---|---|
| Median household income Households · USD/year | $73,971 ±$18,270 | $83,390 ±$362 | $80,734 ±$166 |
| Per-capita income Total population · USD/year | $32,888 ±$3,253 | $46,406 ±$212 | $44,673 ±$122 |
| Category | Count ± MOE | Share ± MOE (pp) |
|---|---|---|
| Below the poverty level | 319 ±226 · low precision | 7.0% ±4.9 pp · low precision |
Household income combines the incomes of everyone in a household; per-capita income divides all income by every resident. The poverty rate is 7.0% (±4.9 percentage points · low precision) under the official Census definition.
Home values, rent and tenure
| Measure / survey universe | City estimate ± MOE | State estimate ± MOE | U.S. estimate ± MOE |
|---|---|---|---|
| Median owner-occupied home value Owner-occupied housing units · USD | $233,200 ±$21,922 | $263,300 ±$797 | $332,700 ±$236 |
| Median gross rent Renter-occupied units paying cash rent · USD/month | $1,552 ±$364 | $1,274 ±$5 | $1,413 ±$2 |
| Category | Count ± MOE | Share ± MOE (pp) |
|---|---|---|
| Owner occupied | 1,216 ±154 | 78.0% ±7.3 pp |
| Renter occupied | 342 ±148 | 22.0% ±9.3 pp |
Owner-occupied units make up 78.0% of occupied housing. Gross rent includes estimated tenant-paid utilities and home values are owners’ own estimates; both cover 2020–2024 leases and homes rather than current listings. The median home value is 3.2 times the median household income.
See housing units, occupancy, rent burden and homeowner costs .
Monthly rent by bedroom count
| Bedrooms | Monthly gross rent | 90% margin of error | Precision |
|---|---|---|---|
| No bedroom (studio) | Unavailable | Unavailable | Unavailable |
| 1 bedroom | Unavailable | Unavailable | Unavailable |
| 2 bedrooms | $1,371 | ±$190 | Estimate with MOE |
| 3 bedrooms | $2,124 | ±$261 | Estimate with MOE |
| 4 bedrooms | Unavailable | Unavailable | Unavailable |
| 5 or more bedrooms | Unavailable | Unavailable | Unavailable |
Census table B25031 describes renter-occupied units paying cash rent within this exact place geography. Gross rent includes contract rent and estimated tenant-paid utilities. These survey medians include existing leases across 2020–2024; they are not current apartment listings. Missing categories stay unavailable, and open-ended medians remain ranges. Small bedroom categories can have large margins of error. Download source values and provenance .
Employment among residents
| Category | Count ± MOE | Share ± MOE (pp) |
|---|---|---|
| In the labor force | 2,397 ±262 | 72.0% ±5.6 pp |
| Not in the labor force | 931 ±222 | 28.0% ±6.3 pp |
| Category | Count ± MOE | Share ± MOE (pp) |
|---|---|---|
| Civilian employed | 2,201 ±247 | 91.8% ±2.3 pp |
| Civilian unemployed | 196 ±146 · low precision | 8.2% ±6.0 pp · low precision |
These estimates describe residents of Cortland wherever they work; jobs at workplaces inside the city appear under jobs located in Cortland. They are 2020–2024 averages, not a current monthly unemployment rate.
Which industries employ residents?
Education, health care and social assistance is the largest of the published broad industry groups among employed residents: 29.8% (656 people; ±6.6 percentage points). The estimate covers residents’ industries wherever they work, rather than employers located inside the place.
| Category | Count ± MOE | Share ± MOE (pp) |
|---|---|---|
| Agriculture, forestry, fishing, hunting and mining | 0 ±18 · low precision | 0.0% ±0.8 pp · low precision |
| Construction | 204 ±90 | 9.3% ±3.9 pp |
| Manufacturing | 157 ±81 · low precision | 7.1% ±3.6 pp · low precision |
| Wholesale trade | 62 ±53 · low precision | 2.8% ±2.4 pp · low precision |
| Retail trade | 301 ±106 | 13.7% ±4.6 pp |
| Transportation, warehousing and utilities | 250 ±99 | 11.4% ±4.3 pp |
| Information | 30 ±36 · low precision | 1.4% ±1.6 pp · low precision |
| Finance, insurance, real estate, rental and leasing | 74 ±48 · low precision | 3.4% ±2.1 pp · low precision |
| Professional, scientific, management, administrative and waste services | 246 ±102 | 11.2% ±4.4 pp |
| Education, health care and social assistance | 656 ±164 | 29.8% ±6.6 pp |
| Arts, entertainment, recreation, accommodation and food services | 112 ±66 · low precision | 5.1% ±2.9 pp · low precision |
| Other services, except public administration | 39 ±32 · low precision | 1.8% ±1.4 pp · low precision |
| Public administration | 70 ±58 · low precision | 3.2% ±2.6 pp · low precision |
Occupations among employed residents
| Category | Count ± MOE | Share ± MOE (pp) |
|---|---|---|
| Management, business, science and arts | 837 ±174 | 38.0% ±6.7 pp |
| Service occupations | 238 ±106 | 10.8% ±4.7 pp |
| Sales and office | 544 ±138 | 24.7% ±5.6 pp |
| Natural resources, construction and maintenance | 258 ±105 | 11.7% ±4.6 pp |
| Production, transportation and material moving | 324 ±108 | 14.7% ±4.6 pp |
| Category | Count ± MOE | Share ± MOE (pp) |
|---|---|---|
| Management occupations | 101 ±57 · low precision | 4.6% ±2.5 pp · low precision |
| Computer and mathematical occupations | 81 ±57 · low precision | 3.7% ±2.6 pp · low precision |
| Educational instruction and library occupations | 136 ±81 · low precision | 6.2% ±3.6 pp · low precision |
| Health practitioners and technical occupations | 310 ±137 | 14.1% ±6.0 pp |
| Sales and related occupations | 257 ±106 | 11.7% ±4.6 pp |
| Transportation occupations | 134 ±70 · low precision | 6.1% ±3.1 pp · low precision |
The detailed groups are subsets of the broad groups and should not be added to them.
How residents get to work
| Category | Count ± MOE | Share ± MOE (pp) |
|---|---|---|
| Drove alone | 1,753 ±244 | 80.0% ±6.5 pp |
| Carpooled | 177 ±90 · low precision | 8.1% ±4.0 pp |
| Public transportation | 42 ±54 · low precision | 1.9% ±2.5 pp · low precision |
| Taxi or ride-hailing | 0 ±13 · low precision | 0.0% ±0.6 pp · low precision |
| Motorcycle | 0 ±13 · low precision | 0.0% ±0.6 pp · low precision |
| Bicycle | 0 ±13 · low precision | 0.0% ±0.6 pp · low precision |
| Walked | 10 ±15 · low precision | 0.5% ±0.7 pp · low precision |
| Other means | 0 ±13 · low precision | 0.0% ±0.6 pp · low precision |
| Worked from home | 210 ±84 | 9.6% ±3.7 pp |
| Category | Count ± MOE | Share ± MOE (pp) |
|---|---|---|
| Under 15 minutes | 931 ±305 | 47.0% ±14.3 pp |
| 15–29 minutes | 388 ±113 | 19.6% ±5.2 pp |
| 30–44 minutes | 273 ±111 | 13.8% ±5.4 pp |
| 45–59 minutes | 189 ±90 | 9.5% ±4.4 pp |
| 60 minutes or longer | 201 ±92 | 10.1% ±4.5 pp |
| Category | Count ± MOE | Share ± MOE (pp) |
|---|---|---|
| No vehicle available | 43 ±41 · low precision | 2.8% ±2.6 pp · low precision |
Travel times cover workers who did not work from home. Vehicle availability is counted per household, not per driver.
Households and residents
Median age is 31.5 years (±3.4). The demographic profile covers age groups, race and Hispanic origin, household types, nativity, languages, education and moves, each compared with Illinois and the U.S.
How many jobs are located in Cortland?
Employers in Cortland reported 1,058 jobs in 2023, -11.5% compared with 2019 (1,195 jobs). That is 23.6 jobs for every 100 residents in the July 2023 population estimate, so most employed residents are likely to work elsewhere. These are jobs at workplaces inside the city limits, wherever the workers live, unlike resident employment figures.
| Industry | Jobs | Share of local jobs | Illinois share |
|---|---|---|---|
| Construction | 720 | 68.1% | 3.9% |
| Manufacturing | 94 | 8.9% | 9.7% |
| Wholesale trade | 47 | 4.4% | 5.0% |
| Transportation and warehousing | 39 | 3.7% | 5.4% |
| Accommodation and food services | 29 | 2.7% | 8.2% |
| Administrative, support and waste management services | 28 | 2.6% | 7.0% |
| Retail trade | 24 | 2.3% | 9.8% |
| Public administration | 21 | 2.0% | 3.8% |
| Information | 13 | 1.2% | 1.8% |
| Other services, except public administration | 13 | 1.2% | 3.5% |
| Real estate and rental and leasing | 11 | 1.0% | 1.3% |
| Finance and insurance | 9 | 0.9% | 5.1% |
| Professional, scientific and technical services | 7 | 0.7% | 7.6% |
| Health care and social assistance | 3 | 0.3% | 14.3% |
| Group | Jobs | Share | Illinois share |
|---|---|---|---|
| $1,250 a month or less | 109 | 10.3% | 16.6% |
| $1,251 to $3,333 a month | 145 | 13.7% | 24.7% |
| More than $3,333 a month | 804 | 76.0% | 58.7% |
| Age 29 or younger | 183 | 17.3% | 22.0% |
| Age 30 to 54 | 691 | 65.3% | 52.8% |
| Age 55 or older | 184 | 17.4% | 25.2% |
Construction is the largest sector for jobs located in Cortland (68.1% of local jobs, compared with 3.9% statewide). Earnings bands describe what each job pays per month, not household income, and a worker can hold more than one job.
Source: Census LEHD Origin-Destination Employment Statistics (LODES) 8.4, workplace area characteristics, all jobs, second-quarter reference date. Census blocks are summed to 2024 place boundaries. Includes private, state and local government and federal civilian jobs; excludes self-employment, military and informal work. Counts include confidentiality noise and are less precise for small places.
Nearby station climate normals
DE KALB, IL (NOAA station USC00112223) is approximately 7.1 km from this place’s Census internal point. The table describes that station’s 1991–2020 climate normals, using NOAA’s corrected version 1.0.1. It is historical station context, rather than a forecast or an average across the city.
| Month | Average daily high (°F) | Average daily low (°F) | Precipitation (inches) |
|---|---|---|---|
| January | 28.1 | 13.1 | 1.69 |
| February | 32.5 | 16.6 | 1.71 |
| March | 45.0 | 26.8 | 2.24 |
| April | 58.6 | 37.3 | 3.56 |
| May | 70.2 | 49.2 | 4.79 |
| June | 79.9 | 59.5 | 4.57 |
| July | 83.1 | 63.3 | 4.00 |
| August | 81.2 | 61.3 | 4.06 |
| September | 74.9 | 53.2 | 3.32 |
| October | 62.0 | 41.0 | 2.96 |
| November | 46.3 | 29.6 | 2.31 |
| December | 33.6 | 19.1 | 2.04 |
Station location: 41.9342°, -88.7756°; elevation 266.1 meters. We select the nearest station within 25 km with all 12 months of high/low temperature and precipitation marked “S” (standard) by NOAA. Standard normals meet NOAA’s data-availability rules and can include estimated missing months. Distance is a straight-line great-circle calculation from the Census internal point. Coastal exposure, elevation and urban conditions can differ between the station and an address. NOAA normals and definitions · Original station CSV · Retained station data, flags and matching details .
Check a specific address before moving
City averages help compare places. A particular home’s school assignment, transit service and flood-map coverage need checks at the address.
- FEMA Flood Map Service Center — search the address, read the effective map and its date, and check any map changes. An unmapped location does not establish an absence of flood risk.
- NCES public school district directory — find district contact information, then use the district’s official address locator or enrollment office to confirm school assignment. A city name or district boundary alone does not assign a school.
- FCC National Broadband Map — check reported service at the exact location, then confirm availability and terms with the provider.
- Check the official transit operator’s route map and timetable for the address and your actual travel hours; the citywide commuting shares above do not measure service on a particular street.
Sources and data notes
Population: Census PEP Vintage 2025, published May 14, 2026. Survey measures: ACS 2020–2024 five-year estimates, published January 29, 2026, dollar figures in 2024 dollars. Geography: Census 2025 Gazetteer, with simplified 2024 state outlines for the locator. Statistical estimates and derived values use the same retained records in profiles, comparison, filters and downloads.
Climate uses NOAA 1991–2020 station normals (v1.0.1); jobs located in the city use LEHD LODES 8.4. Crime, school assignments and hazard scores are not inferred from these datasets, and missing values are never treated as zero. Inspect original sources, read calculation details, download this place’s source observations , or submit a correction.