Indiana · FIPS 18129 · County seat: Mount Vernon
Posey County, IN GIS & Parcel Viewer
Here is the direct link to the county parcel map covering Posey County, IN: Posey County, IN Map. Below you'll find basic facts about the county, steps for using the viewer, and nearby counties.
Open the Posey County parcel map ↗
Opens poseyin.wthgis.com in a new tab. We link out and never embed or copy parcel data.
Map and county facts
| Official map | Posey County, IN Map |
|---|---|
| Type | County-run map |
| Website | poseyin.wthgis.com |
| Access | Free, no login (checked Oct 2026) |
| County seat | Mount Vernon |
| Population | 25,040 (2023 Census Bureau estimate) |
| Land area | 409 sq mi |
| FIPS code | 18129 |
Who runs this map
Posey County runs this viewer (directly or through a contracted vendor), which makes it the closest thing to the source for local parcel lines. When we tested the link in October 2026 it opened with no login and no fee.
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.
Rural addresses don't always geocode well. When that happens, zoom in by hand and click the parcel, or search by owner name.
About Posey County
Posey County had an estimated 25,040 residents in 2023, according to the Census Bureau. With about 409 square miles of land, that works out to roughly 61 people per square mile. That makes it number 61 out of 92 Indiana counties by population. The county seat is Mount Vernon.
Counties next to Posey County
If the property sits near a county line, the parcel may belong to a neighbor. These counties border Posey County:
- Gibson County
- Vanderburgh County (state list)
- Gallatin County, IL
- Henderson County, KY
- Union County, KY (state list)
- White County, IL
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.