Illinois · FIPS 17065 · County seat: McLeansboro
Hamilton County, IL GIS & Parcel Viewer
Looking for lot lines or a parcel number in Hamilton County, IL? The quickest route is the Hamilton 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 Hamilton County parcel map ↗
Opens experience.arcgis.com in a new tab. We link out and never embed or copy parcel data.
Quick facts
| Official map | Hamilton County ArcGIS parcel map |
|---|---|
| Type | County-run map |
| Website | experience.arcgis.com |
| Access | Free, no login (checked Oct 2026) |
| County seat | McLeansboro |
| Population | 7,911 (2023 Census Bureau estimate) |
| Land area | 435 sq mi |
| FIPS code | 17065 |
About the official source
Hamilton County runs this viewer (directly or through a contracted vendor), which makes it the closest thing to the source for local parcel lines. Our October 2026 check found the map open to the public, with no account or payment needed.
Searching for a parcel, step by step
- 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.
Rural addresses don't always geocode well. When that happens, zoom in by hand and click the parcel, or search by owner name.
About Hamilton County
Census Bureau figures put Hamilton County at about 7,911 people (2023 estimate) on roughly 435 square miles of land, which is about 18 residents per square mile. By population it ranks 89th of 102 counties in Illinois. The county seat is McLeansboro.
Neighboring counties
If the property sits near a county line, the parcel may belong to a neighbor. These counties border Hamilton County:
A note on accuracy
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.