Ohio · FIPS 39113 · County seat: Dayton
Montgomery County, OH GIS & Parcel Viewer
Use this page to reach the official county parcel map for Montgomery County, Ohio. The button below opens the Montgomery County parcel map in a new tab, so you can look up parcels by address, owner or parcel number on the source site itself.
Open the Montgomery County parcel map ↗
Opens gis.mcohio.org in a new tab. We link out and never embed or copy parcel data.
Quick facts
| Official map | Montgomery County parcel map |
|---|---|
| Type | County-run map |
| Website | gis.mcohio.org |
| Access | Free, no login (checked Oct 2026) |
| County seat | Dayton |
| Population | 533,796 (2023 Census Bureau estimate) |
| Land area | 461 sq mi |
| FIPS code | 39113 |
Where the parcel data comes from
This map is published by or for Montgomery County itself, so it reflects the local parcel layer rather than a third-party copy. Our October 2026 check found the map open to the public, with no account or payment needed.
How to use the Montgomery 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.
Have a tax bill handy? The parcel or account number on it is usually the fastest way to search.
The county in brief
The U.S. Census Bureau estimated Montgomery County's population at 533,796 in 2023, spread over about 461 square miles of land, or roughly 1,158 people per square mile. Among Ohio's 88 counties, it is the 5th largest by population. The county seat is Dayton.
Counties next to Montgomery County
Parcels close to the edge of Montgomery County can fall in the next county over. Neighboring counties:
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.