Blog · October 13, 2026 · Illinois
Madison County, Illinois: GIS Map Guide
Open the official Madison County parcel viewer, find an owner or a vacant tract, and learn which land records back up what the map shows.
Main page: Madison County, IL GIS & Parcel Viewer (official map link, Madison County facts and neighboring maps).
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Searching for a Madison County GIS map usually means you have a specific piece of ground in mind: a listing near Troy, a woodlot you drive past, or the lot next door.
The sections below cover the map itself, the towns from Troy to Holiday Shores, and the deeds and surveys that settle what the map can't.
Opening the Madison County parcel viewer
Go straight to the Madison County parcel viewer, the county's own public parcel viewer. Once parcel lines appear, click any tract near Edwardsville to see who owns it and how many acres the county records. If the map ever goes missing, check the Madison County, Illinois listing on Platbookmapper for the new address.
Who needs this map
Contractors working in Madison County use the map to find lot dimensions and neighboring owners before they stake a foundation or schedule a survey. Buyers new to Troy often pull the neighbors' parcels too, to see how big the surrounding lots are and who owns them. Anyone hunting for a buildable lot near Troy can spot unbuilt parcels on the aerial layer and look up who owns them.
What the map covers, from Edwardsville to the back roads
Edwardsville is the county seat, and other towns on the map include Alton, Collinsville, Granite City, and Highland. Crossroads communities such as Holiday Shores, Mitchell, and Moro have their own small clusters of lots. Madison County was created in 1812 and takes its name from James Madison. The county's land area is about 716 square miles, and the Census Bureau estimated 262,752 residents there in 2023. Built-up areas around Troy mean most clicks land on platted lots; larger undeveloped tracts are rarer and get attention fast. Watch how parcels line up along the Mississippi River and Horseshoe Lake; waterfront tracts often have odd shapes because the deed follows the water.
Work and land use in Madison County
Federal business data for 2022 shows 5,631 establishments in the county, with retail trade, other services, and health care and social assistance at the top of the list. What stands out is pipeline transportation, petroleum and coal products manufacturing, and primary metal manufacturing: those sectors make up a much larger slice of local businesses than they do nationally. Where a tract near Edwardsville has highway or rail access, expect commercial and farm buyers to take an interest. For a land buyer in Madison County, that mix hints at who your neighbors and competing bidders are likely to be.
Reading property lines on the Madison County GIS map
Zoom in far enough on a lot in Troy and you may notice lines crossing driveways or splitting sheds, a normal quirk of tax mapping. Illinois uses the Public Land Survey System, so rural deeds in Madison County often describe land by section, township and range, and you can match the call to the grid on the map. A survey is the only document that settles where a Madison County boundary actually runs.
Acreage and vacant lot search
A vacant-land search near Collinsville, step by step:
- Start on the outskirts of Alton, where empty lots are easy to spot between the houses on the aerial layer.
- Check who owns each open tract near Alton and where the tax bill goes.
- Confirm legal access. In Madison County, as anywhere, a parcel with no road frontage depends on an easement.
- Line up the assessed land values of a few neighboring tracts near Alton to sanity-check an asking price.
- For a tract near Collinsville, confirm zoning, septic suitability and flood status before you make an offer.
Behind the map: land records in Madison County
For land near Collinsville, the parcel record is the index; the recorded deed is the source. Check the county government website to see which office records deeds for land near Holiday Shores. For subdivision lots in Collinsville, the plat book and page on the record leads straight to the recorded plat.
Near the county line
Shopping near the edge of Madison County? Compare listings in Bond County, Clinton County, and Jersey County too; prices and parcel sizes can shift across the line. Neighboring maps for Madison County are a click away on our Illinois page.
Madison County parcel map FAQ
How can I tell who owns land near Troy?
Search by address if the lot near Troy has one; otherwise click the tract on the map to see the owner of record.
Where do property lines run on a Madison County, IL lot?
The Madison County parcel viewer gets you to the parcel; the recorded plat or deed gives the dimensions; a licensed surveyor marks the corners.
Do I need an account to use the Madison County GIS map?
It costs nothing to look. Anyone can open the Madison County parcel viewer and click parcels in Madison County.
Why is a recent Madison County, IL sale missing from the map?
A sale in Edwardsville has to be recorded and then processed for taxes before the map changes, which takes time.
Open the official Madison County, IL parcel map Madison County in the Platbookmapper directory
Not a survey. County GIS and tax parcel maps are assessment and planning layers. They are not a substitute for a recorded plat, deed, or licensed survey, especially for fences, setbacks, or boundary disputes.