Illinois · FIPS 17015 · County seat: Mount Carroll
Carroll County, IL GIS & Parcel Viewer
Use this page to reach the official county parcel map for Carroll County, Illinois. The button below opens the Carroll County parcel map in a new tab, so you can look up parcels by address, owner or parcel number on the source site itself.
Open the Carroll County parcel map ↗
Opens carroll.illinoisassessors.com in a new tab. We link out and never embed or copy parcel data.
Carroll County at a glance
| Official map | Carroll County parcel map |
|---|---|
| Type | County-run map |
| Website | carroll.illinoisassessors.com |
| Access | May ask you to sign in |
| County seat | Mount Carroll |
| Population | 15,526 (2023 Census Bureau estimate) |
| Land area | 445 sq mi |
| FIPS code | 17015 |
Who runs this map
This map is published by or for Carroll County itself, so it reflects the local parcel layer rather than a third-party copy. This site may show a sign-in form first. Look for a guest or public option; if there isn't one, the county office can tell you how to get access.
Searching for a parcel, step by step
- 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 Carroll County
The U.S. Census Bureau estimated Carroll County's population at 15,526 in 2023, spread over about 445 square miles of land, or roughly 35 people per square mile. By population it ranks 67th of 102 counties in Illinois. Its county seat is Mount Carroll.
Neighboring counties
Carroll County shares a border with the counties below. Each link has its own official map:
Before you rely on the lines
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.