Montana · FIPS 30049 · County seat: Helena
Lewis and Clark County, MT GIS & Parcel Viewer
Parcel lookups for Lewis and Clark County start at City / County Viewer for Lewis and Clark County. This page gives you that official link, notes on how the viewer works, and links to the counties next door.
Open the Lewis and Clark County parcel map ↗
Opens helenamtmaps.maps.arcgis.com in a new tab. We link out and never embed or copy parcel data.
Lewis and Clark County at a glance
| Official map | City / County Viewer for Lewis and Clark County |
|---|---|
| Type | County-run map |
| Website | helenamtmaps.maps.arcgis.com |
| Access | Free, no login (checked Oct 2026) |
| County seat | Helena |
| Population | 75,011 (2023 Census Bureau estimate) |
| Land area | 3,458 sq mi |
| FIPS code | 30049 |
Where the parcel data comes from
Lewis and Clark County runs this viewer (directly or through a contracted vendor), which makes it the closest thing to the source for local parcel lines. Our October 2026 check found the map open to the public, with no account or payment needed.
Finding a property on this map
- Click the button above and wait for the Web AppBuilder viewer to load. Some counties show a terms screen first.
- Search by street address, owner or parcel ID if the search box offers those options.
- Click a lot on the map to read its attributes.
- Turn on aerial imagery from the basemap tool and use the layer list to add things like zoning or flood zones when they're published.
Rural addresses don't always geocode well. When that happens, zoom in by hand and click the parcel, or search by owner name.
The county in brief
Census Bureau figures put Lewis and Clark County at about 75,011 people (2023 estimate) on roughly 3,458 square miles of land, which is about 22 residents per square mile. Among Montana's 56 counties, it is the 6th largest by population. Its county seat is Helena.
Counties next to Lewis and Clark County
If the property sits near a county line, the parcel may belong to a neighbor. These counties border Lewis and Clark County:
- Broadwater County
- Cascade County
- Flathead County
- Jefferson County
- Meagher County
- Powell County
- Teton County
Maps vs. surveys
Keep in mind that a GIS parcel layer is a tax map, not a survey. For exact boundaries, look at the recorded deed and plat or hire a licensed land surveyor.