Ohio · FIPS 39097 · County seat: London
Madison County, OH GIS & Parcel Viewer
Looking for lot lines or a parcel number in Madison County, OH? The quickest route is Ohio Statewide Parcels layer (ArcGIS Map Viewer), the statewide parcel map we keep on file for this county. We link straight to it and add a few tips for getting around.
Open the Madison County statewide map ↗
Opens arcgis.com in a new tab. We link out and never embed or copy parcel data.
Map and county facts
| Official map | Ohio Statewide Parcels layer (ArcGIS Map Viewer) |
|---|---|
| Type | Statewide map (covers all of Ohio) |
| Website | arcgis.com |
| Access | Free, no login (checked Oct 2026) |
| County seat | London |
| Population | 44,602 (2023 Census Bureau estimate) |
| Land area | 466 sq mi |
| FIPS code | 39097 |
Who runs this map
Madison County doesn't have its own viewer in our directory, so we point you to a statewide map: Ohio Statewide Parcels layer (ArcGIS Map Viewer). Zoom in on Madison County to see its parcels. Statewide parcel layers are usually stitched together from county files, so the newest splits or sales may show up on the county's own records first. As of our October 2026 test, anyone could open it without signing in or paying.
Finding a property on this statewide map
- Open Ohio Statewide Parcels layer (ArcGIS Map Viewer) in a new tab and zoom to Madison County (around London).
- Type a street address into the search box, or click directly on a parcel.
- Review the parcel attributes; field names vary by state.
- Confirm anything important with the county assessor, since the statewide layer is a compiled copy.
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.
Madison County by the numbers
Census Bureau figures put Madison County at about 44,602 people (2023 estimate) on roughly 466 square miles of land, which is about 96 residents per square mile. That makes it number 53 out of 88 Ohio counties by population. The county seat is London.
Neighboring counties
Madison County shares a border with the counties below. Each link has its own official map:
- Champaign County
- Clark County
- Fayette County
- Franklin County
- Greene County
- Pickaway County
- Union County (state list)
Maps vs. surveys
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.