Illinois · FIPS 17063 · County seat: Morris
Grundy County, IL GIS & Parcel Viewer
Grundy County, Illinois parcel data lives on the Grundy County parcel map. Open it below in a new tab, then use the short steps on this page to find a property fast.
Open the Grundy County parcel map ↗
Opens maps.grundyco.org in a new tab. We link out and never embed or copy parcel data.
Grundy County at a glance
| Official map | Grundy County parcel map |
|---|---|
| Type | County-run map |
| Website | maps.grundyco.org |
| Access | Free, no login (checked Oct 2026) |
| County seat | Morris |
| Population | 53,578 (2023 Census Bureau estimate) |
| Land area | 418 sq mi |
| FIPS code | 17063 |
About the official source
This map is published by or for Grundy 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 Grundy County viewer
- Press the button above to open the county's own web map.
- Search for the property or pan and zoom to it.
- Click the lot to bring up what the county publishes about it.
- Look for print or measure tools if you need a quick map or rough size.
Rural addresses don't always geocode well. When that happens, zoom in by hand and click the parcel, or search by owner name.
About Grundy County
Census Bureau figures put Grundy County at about 53,578 people (2023 estimate) on roughly 418 square miles of land, which is about 128 residents per square mile. Among Illinois's 102 counties, it is the 25th largest by population. Morris serves as the county seat.
Nearby parcel maps
Grundy County shares a border with the counties below. Each link has its own official map:
A note on accuracy
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.