Illinois · FIPS 17119 · County seat: Edwardsville
Madison County, IL GIS & Parcel Viewer
Parcel lookups for Madison County start at the Madison County parcel map. This page gives you that official link, notes on how the viewer works, and links to the counties next door.
Open the Madison County parcel map ↗
Opens gis.co.madison.il.us in a new tab. We link out and never embed or copy parcel data.
Map and county facts
| Official map | Madison County parcel map |
|---|---|
| Type | County-run map |
| Website | gis.co.madison.il.us |
| Access | Free, no login (checked Oct 2026) |
| County seat | Edwardsville |
| Population | 262,752 (2023 Census Bureau estimate) |
| Land area | 716 sq mi |
| FIPS code | 17119 |
Who runs this map
This map is published by or for Madison County itself, so it reflects the local parcel layer rather than a third-party copy. As of our October 2026 test, anyone could open it without signing in or paying.
Searching for a parcel, step by step
- Open the official link in a new tab.
- Accept any disclaimer, then look for a search box that takes street addresses, owners or parcel IDs.
- Zoom in and click a parcel to see its details.
- Use the map's layer controls to add aerials or other layers if they're offered.
If an address search comes up empty, try the parcel number from a tax bill or deed instead, or click the lot on the map.
The county in brief
The U.S. Census Bureau estimated Madison County's population at 262,752 in 2023, spread over about 716 square miles of land, or roughly 367 people per square mile. By population it ranks 8th of 102 counties in Illinois. Edwardsville serves as the county seat.
Nearby parcel maps
Madison County shares a border with the counties below. Each link has its own official map:
- Bond County
- Clinton County
- Jersey County
- Macoupin County
- Montgomery County
- St. Clair County (state list)
- St. Charles County, MO
- St. Louis City, MO (state list)
- St. Louis County, MO
Maps vs. surveys
The lines you see online are approximate. They're good for finding a lot and its parcel number, but a legal boundary question needs the recorded plat or a surveyor.