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| City | Cortland |
| State | Illinois (IL) |
| County | DeKalb |
| Country | United States of America |
| Timezone | Central Time (America/Chicago) |
| Latitude | 41.920029 |
| Longitude | -88.688696 |
| Population | 4,564 |
| Density | 489.6 /km² |
| Incorporated | N/A |
| ZIP Code(s) | 60112 |
| Area Code | 312, 773 |
| County Seat | Sycamore |
| School District | DeKalb Community Unit School District 428 |
Cortland is a locality in DeKalb County, Illinois, United States. It has a population of approximately 4,564. The population density is 489.6 people per km². Cortland is located at 41.9200°N, 88.6887°W. It observes the Central Time (America/Chicago) timezone. ZIP code: 60112.
Cortland rests in the broad, open embrace of DeKalb County, where the land unfolds in gentle swells under a sky that often stretches from horizon to horizon. It lies 3.2 miles east-south-east of DeKalb, IL (from DeKalb, IL: bearing 102°T), and is situated 4.8 miles south of Sycamore. The fields, stitched together in a patchwork of greens and golds through much of the year, are the dominant feature, giving the landscape a sense of patient, enduring cultivation. Even the modest rise and fall of the terrain feels as if it has been shaped by the slow, steady breath of the wind that sweeps across these prairies. The air here carries the clean, sharp scent of turned earth in spring and the dry, sweet perfume of harvested corn in autumn, a constant reminder of the agricultural heart that beats at Cortland's core. The history of Cortland is written in the furrowed fields and the quiet dignity of its older homes, a testament to the generations who have worked this land since its early settlement. The local economy, deeply rooted in agriculture, still relies on the bounty of the surrounding farms, with corn and soybeans forming the backbone of its prosperity. This enduring connection to the soil shapes the rhythm of life in Cortland, a steady, unhurried cadence that contrasts with the hurried pace of more distant urban centers. While not a place of grand monuments or bustling tourist attractions, Cortland possesses a subtle charm, a quiet strength found in its enduring traditions and the openhearted welcome of its people.
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This page provides an embedded street and satellite map of Cortland, Illinois — switch between views using the small square in the bottom left-hand corner of the map. Coordinates: 41.920029, -88.688696. Live weather conditions are sourced directly from the National Weather Service, with current observations and a 7-day forecast also powered by Open-Meteo. Real-time local news and world news feeds keep the page current, while a Wikipedia summary or an editorially written description provides background on Cortland and DeKalb County.
Detailed location data for Cortland includes the ZIP code (60112), telephone area code (312, 773), county seat of DeKalb County (Sycamore), and school district assignment (DeKalb Community Unit School District 428). These are among the most commonly searched location details for any US city or town.
Location data is drawn from the USGS Geographic Names Information System (GNIS) and cross-verified against 2020 US Census records by coordinate proximity — ensuring the correct Cortland is identified even where the name is shared across multiple counties or states. Population figures are sourced from the 2020 US Census.
| Page generated | July 2026 |
| Location data | SimpleMaps US Cities Database; coordinates matched to USGS GNIS definitive data |
| Wikipedia validation | Article content matched to USGS GNIS coordinates via Wikipedia geosearch API. Location verified by proximity — not name matching alone. |