Montana · FIPS 30003 · County seat: Hardin
Big Horn County, MT GIS & Parcel Viewer
Parcel lookups for Big Horn County start at Montana Cadastral (Montana State Library). This page gives you that official link, notes on how the viewer works, and links to the counties next door.
Open the Big Horn County statewide map ↗
Opens svc.mt.gov in a new tab. We link out and never embed or copy parcel data.
Big Horn County at a glance
| Official map | Montana Cadastral (Montana State Library) |
|---|---|
| Type | Statewide map (covers all of Montana) |
| Website | svc.mt.gov |
| Access | Free, no login (checked Oct 2026) |
| County seat | Hardin |
| Population | 12,751 (2023 Census Bureau estimate) |
| Land area | 4,998 sq mi |
| FIPS code | 30003 |
Where the parcel data comes from
The link goes to a statewide map (Montana Cadastral (Montana State Library)). It shows parcels for Big Horn County along with the rest of Montana. 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. When we tested the link in October 2026 it opened with no login and no fee.
Finding a property on this statewide map
- Press the button to load the statewide viewer, then move the map to Big Horn County.
- Use the viewer's search tool to find an address or parcel, if it has one.
- Click a lot to read its details.
- For deeds, taxes or official copies, take the parcel number to the county's own offices.
Rural addresses don't always geocode well. When that happens, zoom in by hand and click the parcel, or search by owner name.
About Big Horn County
The U.S. Census Bureau estimated Big Horn County's population at 12,751 in 2023, spread over about 4,998 square miles of land, or roughly 2.6 people per square mile. Among Montana's 56 counties, it is the 16th largest by population. The county seat is Hardin.
Nearby parcel maps
Big Horn County shares a border with the counties below. Each link has its own official map:
- Carbon County
- Powder River County
- Rosebud County
- Treasure County
- Yellowstone County
- Big Horn County, WY
- Sheridan County, WY
Maps vs. surveys
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.