Illinois · FIPS 17121 · County seat: Salem
Marion County, IL GIS & Parcel Viewer
Parcel lookups for Marion County start at the Marion County ArcGIS parcel map. This page gives you that official link, notes on how the viewer works, and links to the counties next door.
Open the Marion County parcel map ↗
Opens marioncounty.maps.arcgis.com in a new tab. We link out and never embed or copy parcel data.
Quick facts
| Official map | Marion County ArcGIS parcel map |
|---|---|
| Type | County-run map |
| Website | marioncounty.maps.arcgis.com |
| Access | Free, no login (checked Oct 2026) |
| County seat | Salem |
| Population | 36,673 (2023 Census Bureau estimate) |
| Land area | 573 sq mi |
| FIPS code | 17121 |
About the official source
Marion County runs this viewer (directly or through a contracted vendor), which makes it the closest thing to the source for local parcel lines. As of our October 2026 test, anyone could open it without signing in or paying.
Searching for a parcel, step by step
- Click the button above and wait for the Web AppBuilder viewer to load. Some counties show a terms screen first.
- Search by street address, owner or parcel ID if the search box offers those options.
- Click a lot on the map to read its attributes.
- Turn on aerial imagery from the basemap tool and use the layer list to add things like zoning or flood zones when they're published.
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
Census Bureau figures put Marion County at about 36,673 people (2023 estimate) on roughly 573 square miles of land, which is about 64 residents per square mile. That makes it number 37 out of 102 Illinois counties by population. Its county seat is Salem.
Nearby parcel maps
If the property sits near a county line, the parcel may belong to a neighbor. These counties border Marion County:
Before you rely on the lines
Keep in mind that a GIS parcel layer is a tax map, not a survey. For exact boundaries, look at the recorded deed and plat or hire a licensed land surveyor.