Oklahoma · FIPS 40057 · County seat: Hollis
Harmon County, OK GIS & Parcel Viewer
Looking for lot lines or a parcel number in Harmon County, OK? The quickest route is OKMaps (Oklahoma Office of Geographic Information) - Statewide Parcels layer, 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 Harmon County statewide map ↗
Opens okmaps.org in a new tab. We link out and never embed or copy parcel data.
Map and county facts
| Official map | OKMaps (Oklahoma Office of Geographic Information) - Statewide Parcels layer |
|---|---|
| Type | Statewide map (covers all of Oklahoma) |
| Website | okmaps.org |
| Access | Free, no login (checked Oct 2026) |
| County seat | Hollis |
| Population | 2,392 (2023 Census Bureau estimate) |
| Land area | 537 sq mi |
| FIPS code | 40057 |
Who runs this map
Harmon County doesn't have its own viewer in our directory, so we point you to a statewide map: OKMaps (Oklahoma Office of Geographic Information) - Statewide Parcels layer. Zoom in on Harmon County to see its parcels. Because a state agency compiles this layer from local data, check with the Harmon County assessor or recorder before relying on a recent change. Our October 2026 check found the map open to the public, with no account or payment needed.
How to use the Harmon County viewer
- Open OKMaps with the button above. Parcel lines are hidden until you add them.
- Go to Explore > Land Parcels > Statewide Parcels and click the green + to put the parcel layer on the map.
- Zoom in on Harmon County (around Hollis); the lot lines only draw at close zoom levels.
- Click a parcel to read its attributes, then take the parcel number to the Harmon County assessor for tax or ownership records.
Rural addresses don't always geocode well. When that happens, zoom in by hand and click the parcel, or search by owner name.
About Harmon County
Harmon County had an estimated 2,392 residents in 2023, according to the Census Bureau. With about 537 square miles of land, that works out to roughly 4.5 people per square mile. By population it ranks 76th of 77 counties in Oklahoma. The county seat is Hollis.
Neighboring counties
Harmon County shares a border with the counties below. Each link has its own official map:
- Beckham County
- Greer County
- Jackson County
- Childress County, TX
- Collingsworth County, TX
- Hardeman County, TX
Maps vs. surveys
Treat the map as a guide, not a boundary survey: parcel outlines are often shifted a bit from the real corners. A licensed surveyor settles exact lines.