County GIS · Parcel viewers · October 18, 2026

Montana County GIS Websites: Parcel Viewers by County

Which parcel map software each Montana county uses (56 of 56 verified), how to search the common viewers, and a link to every official map.

Looking for Montana county GIS websites? Montana has 56 counties, and their official parcel maps do not all run on the same software. Knowing which viewer a county uses tells you what the search box expects and where the parcel report is.

Montana does not run one statewide parcel map that every county uses. Each local government picks its own viewer, so the screen you see in one county can look nothing like the one next door. This guide sorts all 56 Montana entries in the Platbookmapper directory with the software behind each official map.

Montana at a glance

• Entries in the directory: 56
• With a verified public parcel viewer: 56
• county web map: 38
• ArcGIS Experience Builder: 7
• ArcGIS Web AppBuilder: 4
• ArcGIS Map Viewer: 4
• ArcGIS Instant Apps: 2
• ArcGIS: 1

36 of these entries point to a statewide viewer rather than a county-run site (Montana Cadastral (Montana State Library)). A statewide map is handy for crossing county lines, but the local office is still where deeds and tax records are kept.

The most populous counties

The busiest offices are worth knowing first, since most searches land there.

How to search the most common viewers in Montana

county web map (38 entries, e.g. Big Horn County, Blaine County, Broadwater County)

1. Open the official map link from the county's page; it opens in a new tab.
2. Accept any disclaimer, then look for a search box that takes street addresses, owners or parcel IDs.
3. Zoom in and click a parcel to see its details.
4. Use the map's layer controls to add aerials or other layers if they're offered.

ArcGIS Experience Builder (7 entries, e.g. Beaverhead County, Cascade County, Gallatin County)

1. Open the link. This viewer is an ArcGIS Experience Builder app, so its layout is custom to the publisher.
2. Look for a search box or search widget and type in a street address or parcel ID.
3. Click a parcel to see its details in a pop-up or side panel.
4. Check the toolbar for a layer list or basemap switcher if you want aerials or other layers.

ArcGIS Web AppBuilder (4 entries, e.g. Flathead County, Lewis and Clark County, Lincoln County)

1. Open the official map link from the county's page. The viewer is built with ArcGIS Web AppBuilder; if a disclaimer pops up, accept it to continue.
2. Use the search widget, usually in the upper left, to find a street address or parcel ID.
3. Click a parcel to open its info window.
4. The widget bar holds extras such as the layer list, basemap switcher, measure and print tools.

Every Montana entry and its viewer

Before you rely on what you find

Online parcel lines are drawn for tax mapping, not surveys, so they can sit a few feet off the real boundary. For anything legal, such as a fence, a sale or a dispute, use the recorded deed and a licensed surveyor. To check flood zones, soils or wetlands for a spot you found, open it on the Platbookmapper Land Map, which pulls FEMA, USDA and U.S. Fish & Wildlife layers.

See also: Montana on Platbookmapper.

Related guides

• Montana landowner maps for hunting

Sources

• Platbookmapper county GIS directory (the live data file behind our county pages, pulled October 18, 2026). Viewer types are read from each official map's web address.
• U.S. Census Bureau, Population Estimates Program, county totals, Vintage 2023 (July 1, 2023 estimates)
• County seats: Wikidata (county seat property), cross-checked against Census place names.