Ohio · FIPS 39167 · County seat: Marietta
Washington County, OH GIS & Parcel Viewer
Looking for lot lines or a parcel number in Washington 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 Washington County statewide map ↗
Opens arcgis.com in a new tab. We link out and never embed or copy parcel data.
Washington County at a glance
| 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 | Marietta |
| Population | 58,577 (2023 Census Bureau estimate) |
| Land area | 632 sq mi |
| FIPS code | 39167 |
Who runs this map
This is a statewide map, not a county site. Ohio Statewide Parcels layer (ArcGIS Map Viewer) covers parcels across Ohio, and Washington County is one part of it. A statewide layer can trail the county's own books by weeks or months, so treat it as a fast first look rather than the final word. When we tested the link in October 2026 it opened with no login and no fee.
Searching for a parcel, step by step
- Open the statewide map with the button above.
- Search for an address in Washington County, or zoom to the county on the map.
- Click a parcel to see the attributes the state layer includes.
- Write down the parcel number and use it for records searches with the Washington County assessor or recorder.
Have a tax bill handy? The parcel or account number on it is usually the fastest way to search.
About Washington County
The U.S. Census Bureau estimated Washington County's population at 58,577 in 2023, spread over about 632 square miles of land, or roughly 93 people per square mile. Among Ohio's 88 counties, it is the 44th largest by population. Its county seat is Marietta.
Nearby parcel maps
If the property sits near a county line, the parcel may belong to a neighbor. These counties border Washington County:
- Athens County
- Monroe County
- Morgan County
- Noble County
- Pleasants County, WV
- Tyler County, WV
- Wood County, WV
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.