Illinois · FIPS 17051 · County seat: Vandalia
Fayette County, IL GIS & Parcel Viewer
Looking for lot lines or a parcel number in Fayette County, IL? The quickest route is the Fayette County ArcGIS parcel map, the county parcel map we keep on file for this county. We link straight to it and add a few tips for getting around.
Open the Fayette County parcel map ↗
Opens portico.sidwellco.com in a new tab. We link out and never embed or copy parcel data.
Fayette County at a glance
| Official map | Fayette County ArcGIS parcel map |
|---|---|
| Type | County-run map |
| Website | portico.sidwellco.com |
| Access | Free, no login (checked Oct 2026) |
| County seat | Vandalia |
| Population | 21,164 (2023 Census Bureau estimate) |
| Land area | 716 sq mi |
| FIPS code | 17051 |
Who runs this map
This map is published by or for Fayette County itself, so it reflects the local parcel layer rather than a third-party copy. Our October 2026 check found the map open to the public, with no account or payment needed.
How to use the Fayette County viewer
- Open the link. This viewer is an ArcGIS Experience Builder app, so its layout is custom to the publisher.
- Look for a search box or search widget and type in a street address or parcel ID.
- Click a parcel to see its details in a pop-up or side panel.
- Check the toolbar for a layer list or basemap switcher if you want aerials or other layers.
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
Fayette County had an estimated 21,164 residents in 2023, according to the Census Bureau. With about 716 square miles of land, that works out to roughly 30 people per square mile. That makes it number 54 out of 102 Illinois counties by population. The county seat is Vandalia.
Neighboring counties
Fayette County shares a border with the counties below. Each link has its own official map:
Maps vs. surveys
Treat the map as a guide, not a boundary survey: parcel outlines are often shifted a bit from the real corners. A licensed surveyor settles exact lines.