Madison County GIS Maps
Madison County, Illinois, has 265,859 residents and covers 716.1 square miles. The population declined 1.3% between the 2010 and 2020 census. More residents left than arrived over that decade. The FIPS code for Madison County is 17119.
Granite City is the county's largest population center. Madison County also includes 28 zip codes, 12 public school districts and 44 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.
Madison County Trends
- Population
- 265,859▾
- Median Home Value
- $167,900▴
- K-12 Enrollment
- 37,592▾
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.
Madison 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.
Madison County Population
Madison County had 265,859 residents in 2020. That was 1.3% lower than in 2010. Madison County added 6,918 people between 2000 and 2020, which points to steady long-term growth. The county is fairly spread out, with about 371 people per square mile. Some of the county's most populated postal areas include Granite City, Edwardsville and Collinsville.
Population Trend in Madison County IL
Madison County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Madison County Zip Codes
Madison County has 28 zip codes. Some of the county's most populated zip codes include Granite City (62040), Edwardsville (62025) and Collinsville (62234). Granite City is the largest zip by population, with about 40,872 residents or 15% of the county total. Together, the three largest zips account for about 41% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Madison County IL
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 62040 | Granite City | 40,872 | ▾ -6.5% |
| 62025 | Edwardsville | 35,229 | ▴ 4.4% |
| 62234 | Collinsville | 31,843 | ▾ -4.7% |
| 62002 | Alton | 30,176 | ▾ -7.7% |
| 62035 | Godfrey | 16,172 | ▾ -2% |
| Download all zip code data | |||
Madison County Zip Code populations and trends per most recent census data.
Madison County Demographics
Madison County has a median age of 40.2, which makes the county a little older than Illinois overall. About 21.5% of residents are under 18, while 18% 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 31.5% of the population, which points to a solid working-age base. About 30.8% of adults have a bachelor's degree or higher, above the statewide figure of 37.2%. The county is mostly White by population, though Hispanic, Asian, Black and multiracial residents are also part of the local mix.
Key Demographics for Madison County IL
Median Age
40.2
Under 18
21.5%
Age 65+
18%
Bachelor's+
30.8%
Madison County School Districts
Madison County is served by 12 public school districts with 37,592 students enrolled in 2024. The largest districts on the county map are Edwardsville Community Unit 7, Collinsville Community Unit 10 and Granite City Community Unit 9. Those three districts account for about 50% 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 Madison County IL
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Edwardsville Community Unit School District 7 | 7,060 | 18.8% | ▾ -2.1% |
| Collinsville Community Unit School District 10 | 6,031 | 16% | ▴ 1.1% |
| Granite City Community Unit School District 9 | 5,747 | 15.3% | ▾ -0.5% |
| Alton Community Unit School District 11 | 5,526 | 14.7% | ▾ -2.4% |
| Triad Community Unit School District 2 | 4,009 | 10.7% | ▴ 0.1% |
| Download all school district data | |||
Madison County school district enrollment and trends per most recent NCES reporting data.
Madison County Housing & Real Estate
Madison County has a median home value of $167,900 and a median gross rent of $969. About 74% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run below the Illinois median, while rents come in below the state average. In March 2026, the median listing price was $206,500 and homes spent about 46 days on the market.
Madison County Housing Mix
Madison County housing mix: owner, renter and vacant units.
Madison County Housing Trends
Madison County median home value and rent trend (last 5 years).
Businesses in Madison County, IL
Madison County has 10,642 business listings across 813 categories. The largest categories in Madison County business listings are Churches & Religious Organizations (336, 3.2%), Real Estate Agents (180, 1.7%), and Insurance Agencies (166, 1.6%). The full Madison County business listings dataset includes names, categories, addresses and contact details where available. Madison County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Madison County, IL
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 336 | 3.2% |
| Real Estate Agents | 180 | 1.7% |
| Insurance Agencies | 166 | 1.6% |
| Auto Repair | 156 | 1.5% |
| Contractors | 143 | 1.3% |
| Parks & Recreation | 138 | 1.3% |
| ATMs | 133 | 1.2% |
| Fast Food | 123 | 1.2% |
| Banks & Credit Unions | 120 | 1.1% |
| Beauty Salons | 117 | 1.1% |
Madison County Business Listings
| Business | Category | City |
|---|---|---|
| Hope Clinic | Abortion Clinic | Granite City |
| Chestnut Health Systems | Abuse And Addiction Treatment | Maryville |
| SIUE Cougar Store | Academic Bookstore | Edwardsville |
| Cougar Village | Accommodation | Edwardsville |
| Scheffel Boyle CPAs | Accountant | Edwardsville |
| Belk Park Golf Course | Active Life | Wood River |
| Rising Sun Acupuncture | Acupuncture | Edwardsville |
| Building Bonds & Bridges Educ | Adult Education | Edwardsville |
| Sam & Delilah | Adult Entertainment | Alton |
| Studio 162 | Advertising Agency | Granite City |
| Download Madison County business listings | ||
Madison County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Madison County Basemaps
Madison 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 Madison County Data Package
This page shows a preview of what's included in the Madison 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 Madison County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.