Ohio · FIPS 39107 · County seat: Celina
Mercer County, OH GIS & Parcel Viewer
Parcel lookups for Mercer County start at Parcel Viewer Plus 2.0 for Mercer County. This page gives you that official link, notes on how the viewer works, and links to the counties next door.
Open the Mercer County parcel map ↗
Opens experience.arcgis.com in a new tab. We link out and never embed or copy parcel data.
Map and county facts
| Official map | Parcel Viewer Plus 2.0 for Mercer County |
|---|---|
| Type | County-run map |
| Website | experience.arcgis.com |
| Access | Free, no login (checked Oct 2026) |
| County seat | Celina |
| Population | 42,439 (2023 Census Bureau estimate) |
| Land area | 462 sq mi |
| FIPS code | 39107 |
Where the parcel data comes from
This map is published by or for Mercer County itself, so it reflects the local parcel layer rather than a third-party copy. As of our October 2026 test, anyone could open it without signing in or paying.
How to use the Mercer County viewer
- Open the link. This viewer is an ArcGIS Experience Builder app, so its layout is custom to the publisher.
- Look for a search box or search widget and type in a street address or parcel ID.
- Click a parcel to see its details in a pop-up or side panel.
- Check the toolbar for a layer list or basemap switcher if you want aerials or other layers.
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.
About Mercer County
Census Bureau figures put Mercer County at about 42,439 people (2023 estimate) on roughly 462 square miles of land, which is about 92 residents per square mile. Among Ohio's 88 counties, it is the 57th largest by population. Its county seat is Celina.
Counties next to Mercer County
If the property sits near a county line, the parcel may belong to a neighbor. These counties border Mercer County:
Maps vs. surveys
Online parcel lines are drawn for tax and planning use. They can be off by several feet, so use a recorded plat or a licensed surveyor for fences, setbacks or a sale.