Indiana · FIPS 18097 · County seat: Indianapolis
Marion County, IN GIS & Parcel Viewer
Marion County, Indiana parcel data lives on MapIndy for Marion County. Open it below in a new tab, then use the short steps on this page to find a property fast.
Open the Marion County parcel map ↗
Opens maps.indy.gov in a new tab. We link out and never embed or copy parcel data.
Map and county facts
| Official map | MapIndy for Marion County |
|---|---|
| Type | County-run map |
| Website | maps.indy.gov |
| Access | Free, no login (checked Oct 2026) |
| County seat | Indianapolis |
| Population | 968,460 (2023 Census Bureau estimate) |
| Land area | 397 sq mi |
| FIPS code | 18097 |
Who runs this map
Marion 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.
How to use the Marion 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 Marion County
Census Bureau figures put Marion County at about 968,460 people (2023 estimate) on roughly 397 square miles of land, which is about 2,439 residents per square mile. That makes it the most populous of Indiana's 92 counties. The county seat is Indianapolis.
Nearby parcel maps
If the property sits near a county line, the parcel may belong to a neighbor. These counties border Marion County:
- Boone County
- Hamilton County (state list)
- Hancock County
- Hendricks County
- Johnson County
- Morgan County
- Shelby County
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.