Cook County GIS Maps
Cook County, Illinois, has 5,275,541 residents and covers 944.9 square miles. The population grew 1.6% between the 2010 and 2020 census. More residents moved in than left over that decade. The FIPS code for Cook County is 17031.
Chicago is the county's largest population center. Cook County also includes 167 zip codes, 5 public school districts and 55 municipalities. Those boundaries help explain why population, schools, and housing can look different from one part of the county to another. The map below shows how those county lines, zip codes, and school districts fit together, and the sections that follow use that same geography to show population, demographics, school enrollment and housing patterns in more detail.
Maps, GIS layers and sample data. Paid packages add full layers, analytics and database files.
Cook County Trends
- Population
- 5,275,541▴
- Median Home Value
- $305,200▴
- K-12 Enrollment
- 389,715▴
County analytics dashboards with historical trends & projections included in package downloads.
Free starter access previews county maps, lightweight GIS, and sample data. Paid packages unlock full GIS layers, analytics, and database files.
Cook County Maps
The maps below show a few of the county map styles included in our downloads. County packages include map exports in JPEG, PNG, SVG, PDF and GeoTIFF formats plus more than 20 GIS layers for mapping, research and analysis. Available layers include zip codes, area codes, subdivisions, school districts, political boundaries, roads, water features, points of interest and more.
County packages also include historical county demographics, business intelligence, analytical dashboards, AI-ready prompts, markdown files and related reference data. Everything is organized to save hours of manual work collecting current data, cleaning it and joining it together. That makes it easier to move faster on analytics, due diligence, business planning and location research. Paid packages are built for commercial use, but some package contents include source-specific attribution or notice guidance. Review Licensing & Data Source Notices.
Cook County Population
Cook County had 5,275,541 residents in 2020. That was 1.6% higher than in 2010. Cook County had 101,200 fewer people in 2020 than it did in 2000, which points to a long-term population decline. The county is fairly spread out, with about 5,583 people per square mile. Some of the county's most populated postal areas include Chicago, Chicago and Chicago.
Population Trend in Cook County IL
Cook County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Cook County Zip Codes
Cook County has 167 zip codes. Some of the county's most populated zip codes include Chicago (60629), Chicago (60632) and Chicago (60618). Chicago is the largest zip by population, with about 114,453 residents or 2% of the county total. Together, the three largest zips account for about 6% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Cook County IL
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 60629 | Chicago | 114,453 | ▴ 0.5% |
| 60632 | Chicago | 92,237 | ▴ 1% |
| 60618 | Chicago | 90,316 | ▾ -1.9% |
| 60639 | Chicago | 89,543 | ▾ -1% |
| 60623 | Chicago | 87,649 | ▾ -4.8% |
| Download all zip code data | |||
Cook County Zip Code populations and trends per most recent census data.
Cook County Demographics
Cook County has a median age of 37.8, which makes the county a little younger than Illinois overall. About 21.4% of residents are under 18, while 15.5% are 65 or older. That gives the county a fairly even mix of younger families and older adults. The largest age group is 25 to 44 at about 36% of the population, which points to a solid working-age base. About 41.9% of adults have a bachelor's degree or higher, above the statewide figure of 37.2%. The county has a more diverse population mix, with no single race or ethnicity accounting for all of the local story.
Key Demographics for Cook County IL
Median Age
37.8
Under 18
21.4%
Age 65+
15.5%
Bachelor's+
41.9%
Cook County School Districts
Cook County is served by 5 public school districts with 389,715 students enrolled in 2024. The largest districts on the county map are Chicago Public 299, School District U-46 and Community Unit 300. Those three districts account for about 97% of public school enrollment in the map area. Total enrollment has stayed fairly steady in recent years, but it is slightly lower than it was in 2017.
Largest School Districts by Enrollment in Cook County IL
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Chicago Public School District 299 | 324,130 | 83.2% | ▴ 0.4% |
| School District U-46 | 34,036 | 8.7% | ▾ -1.5% |
| Community Unit School District 300 | 20,705 | 5.3% | ▴ 1.1% |
| Barrington Community Unit School District 220 | 7,936 | 2% | ▾ -1.1% |
| Elmwood Park Community Unit School District 401 | 2,908 | 0.7% | ▴ 1.1% |
| Download all school district data | |||
Cook County school district enrollment and trends per most recent NCES reporting data.
Cook County Housing & Real Estate
Cook County has a median home value of $305,200 and a median gross rent of $1,381. About 58% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run above the Illinois median, while rents come in above the state average. In March 2026, the median listing price was $324,900 and homes spent about 36 days on the market.
Cook County Housing Mix
Cook County housing mix: owner, renter and vacant units.
Cook County Housing Trends
Cook County median home value and rent trend (last 5 years).
Businesses in Cook County, IL
Cook County has 203,598 business listings across 1,537 categories. The largest categories in Cook County business listings are Medical Offices (4,272, 2.1%), Churches & Religious Organizations (3,986, 2.0%), and Real Estate Agents (3,638, 1.8%). The full Cook County business listings dataset includes names, categories, addresses and contact details where available. Cook County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Cook County, IL
| Category | Businesses | Share |
|---|---|---|
| Medical Offices | 4,272 | 2.1% |
| Churches & Religious Organizations | 3,986 | 2.0% |
| Real Estate Agents | 3,638 | 1.8% |
| Beauty Salons | 2,669 | 1.3% |
| Insurance Agencies | 2,534 | 1.2% |
| Parks & Recreation | 2,512 | 1.2% |
| Auto Repair | 2,480 | 1.2% |
| Hair Salons | 2,468 | 1.2% |
| Community & Nonprofits | 2,393 | 1.2% |
| Professional Services | 2,387 | 1.2% |
Cook County Business Listings
| Business | Category | City |
|---|---|---|
| Fast and Easy Printing Co. | 3D Printing Service | Des Plaines |
| Rose Women's Medical Center | Abortion Clinic | Franklin Park |
| Heather Health Care Center | Abuse And Addiction Treatment | Harvey |
| Northwestern University Bookstore | Academic Bookstore | Chicago |
| Berry Bliss Açaí Bowls & More | Acai Bowls | Chicago |
| OneEleven | Accommodation | Chicago |
| Crowe LLP | Accountant | Chicago |
| Stan Roller & Associates Inc | Acoustical Consultant | Berwyn |
| Decoma Day Camp | Active Life | Northbrook |
| Herb + Ōhm | Acupuncture | Chicago |
| Download Cook County business listings | ||
Cook County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Cook County Basemaps
Cook County map and data packages include a set of useful basemaps to help you get started quickly. These include a custom light grey canvas, USGS topo, imagery and other reference layers that make it easier to build clear, meaningful county maps using the included GIS layers, your own data or both. Pre-rendered map tiles for the light grey basemap are included so you can use them offline or host them on your own CDN.
Get the Full Cook County Data Package
This page shows a preview of what's included in the Cook County data package. The full package gives you a ready-to-use county data system with GIS layers, historical data, maps, database files and planning tools that save hours of manual data gathering, cleanup and joins. Everything is organized to help you skip data wrangling and start analysis faster.
- 20+ GIS layers for zip codes, school districts, roads, water, boundaries and more
- Historical county demographics, housing, income and trend data
- ZIP code population files and school district enrollment history
- Database files, markdowns, AI-ready prompts and documentation
- Map exports in PNG, JPEG, PDF, SVG and GeoTIFF formats
- Offline-ready data explorer, map and analytics tools
Paid packages support commercial use, client work, and derived outputs. Some package contents may include source-specific attribution or provider notices. See Licensing & Data Source Notices.
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Nearby Counties
Browse county data pages for the counties that border Cook County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.