Illinois · FIPS 17109 · County seat: Macomb
McDonough County, IL GIS & Parcel Viewer
Here is the direct link to the county parcel map covering McDonough County, IL: McDonough Co, Illinois Map. Below you'll find basic facts about the county, steps for using the viewer, and nearby counties.
Open the McDonough County parcel map ↗
Opens mcdonoughil.wthgis.com in a new tab. We link out and never embed or copy parcel data.
McDonough County at a glance
| Official map | McDonough Co, Illinois Map |
|---|---|
| Type | County-run map |
| Website | mcdonoughil.wthgis.com |
| Access | Free, no login (checked Oct 2026) |
| County seat | Macomb |
| Population | 26,839 (2023 Census Bureau estimate) |
| Land area | 589 sq mi |
| FIPS code | 17109 |
Who runs this map
It is a county-level map: McDonough County or the company it hires keeps the parcel layer up to date. As of our October 2026 test, anyone could open it without signing in or paying.
Finding a property on this map
- Open the official link; the map is hosted on WTH GIS, a vendor platform used by 44 counties in our directory.
- Accept any disclaimer, then use the search tool to find a street address, owner or parcel ID.
- Click a parcel to view its attributes.
- Use the layer or basemap controls to add aerials and other layers where the county provides them.
Have a tax bill handy? The parcel or account number on it is usually the fastest way to search.
McDonough County by the numbers
The U.S. Census Bureau estimated McDonough County's population at 26,839 in 2023, spread over about 589 square miles of land, or roughly 46 people per square mile. Among Illinois's 102 counties, it is the 50th largest by population. Macomb serves as the county seat.
Nearby parcel maps
Parcels close to the edge of McDonough County can fall in the next county over. Neighboring counties:
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.