Cortland is a town in DeKalb County, Illinois, home to about 4,564 people across 3.6 square miles. Its ZIP code is 60112, and parts of 60151 are in Cortland too.
Homes sold for a median of $183 per square foot in the three months ending August 2026, a balanced market.
Mostly Cortland
Mostly Maple Park; part is in Cortland
Each card is that ZIP code’s whole market, including any part outside Cortland. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Cortland’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Chicago O'Hare International Airport (ORD)39 miles away |
|---|---|
| Closer regional airport | Chicago Rockford International Airport (RFD)29 miles away |
| Nearest city of 250,000+ | Chicago, IL51 miles away |
Straight-line distances from the center of Cortland; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Cortland had 4,398 residents in the 2020 census, up 113% since 2000.
It’s the 348th largest of 1,450 towns in Illinois by population.
DeKalb County grew from 31,756 residents in 1900 to 100,420 in 2020.
DeKalb County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 83°F in summer, and winter lows average 13°F. About 37.3 inches of rain and melted snow fall in a typical year, with about 33 inches of snow.
Source: NOAA 1991–2020 climate normals, De Kalb, IL weather station (6 miles away).
29,129 jobs at 1,975 businesses in DeKalb County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
4 doctors and other health care providers list an office in Cortland.
Nearest hospitals
Providers with an office here
| Mental health providers | 4 |
|---|
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (4 nearby)
Grocery stores
Pharmacies
Libraries (1 nearby)
Museums
Theaters and performance venues
Counts are within about 1.5 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Established in 1865.
Notable people born here
Source: Wikidata (wikidata.org), the free knowledge base; people are listed by place of birth.
Public schools here are run by DeKalb CUSD 428. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Cortland Elementary SchoolCortland | K–5 | 523 | Public | 1.0 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Maple Park, Lily Lake and Virgil.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.