Montana · FIPS 30017 · County seat: Miles City
Custer County, MT GIS & Parcel Viewer
Custer County, Montana parcel data lives on Montana Cadastral (Montana State Library). Open it below in a new tab, then use the short steps on this page to find a property fast.
Open the Custer County statewide map ↗
Opens svc.mt.gov in a new tab. We link out and never embed or copy parcel data.
Map and county facts
| 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 | Miles City |
| Population | 11,985 (2023 Census Bureau estimate) |
| Land area | 3,783 sq mi |
| FIPS code | 30017 |
About the official source
The link goes to a statewide map (Montana Cadastral (Montana State Library)). It shows parcels for Custer County along with the rest of Montana. 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.
How to use the Custer County viewer
- Press the button to load the statewide viewer, then move the map to Custer 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.
Many parcel sites expect owner names last name first. If a full name finds nothing, try just the surname.
Custer County by the numbers
Census Bureau figures put Custer County at about 11,985 people (2023 estimate) on roughly 3,783 square miles of land, which is about 3.2 residents per square mile. By population it ranks 17th of 56 counties in Montana. Its county seat is Miles City.
Nearby parcel maps
Parcels close to the edge of Custer County can fall in the next county over. Neighboring counties:
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.