Blog · October 8, 2026 · Montana
Plat Map of Jefferson County, Montana
A practical guide to the Jefferson County plat map: the official link, towns and land across the county, property lines, and where deeds are recorded.
Main page: Jefferson County, MT GIS & Parcel Viewer (official map link, Jefferson County facts and neighboring maps).
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Parcel lines, owner names and acreage for every tract from Basin to Boulder are a few clicks away on the Jefferson County plat map, and it costs nothing to use.
This guide walks through the official link, the kinds of land you'll find around Boulder, and what to do when the map and the ground don't agree.
How to use the Jefferson County plat map
Open the Jefferson County ArcGIS parcel map (built on an Esri ArcGIS web map); it is the county's own published map. A parcel number from a Jefferson County tax bill is the most precise search; failing that, an owner name or a click on the map near Boulder works. The same link lives on our Jefferson County county page, along with links for the surrounding area.
Who needs this map
Here's who tends to use it in Jefferson County. If you hunt the country around Jefferson City, the owner layer tells you who to ask and where the next property begins. A buyer who wants ten or twenty acres near Boulder can rule out most of the wrong tracts from a desk before driving out. An owner in Boulder planning a fence or an outbuilding pulls the parcel first, then the recorded plat.
Jefferson County at a glance: towns and land
Most of the platted lots cluster in and around Boulder (the county seat) and Whitehall. Unincorporated spots like Basin, Cardwell, and Clancy are worth a look if you want rural acreage near a crossroads community. Organized in 1865, and named for Thomas Jefferson, Jefferson County has a long paper trail, and early deeds may cite landmarks that no longer exist. About 13,048 people lived in Jefferson County in 2023, according to Census Bureau estimates, on roughly 1,657 square miles. Away from Basin, expect big ownership blocks: at this density, ranch, farm and timber tracts fill most of the map. On the parcel layer, Deerlodge National Forest and Helena National Forest show up as public ground, and the private tracts along their edges are worth checking line by line.
Work and land use in Jefferson County
Federal business data for 2022 shows 330 establishments in the county, with construction, accommodation and food services, and professional and technical services at the top of the list. What stands out is utilities, specialty trade contractors, and building construction: those sectors make up a much larger slice of local businesses than they do nationally.
How accurate are Jefferson County, MT property lines?
Lines on the map show roughly where one parcel near Whitehall ends and the next begins; the exact spot is a surveyor's call. Square-ish tracts around Basin are no accident: Montana land was surveyed into sections, and deeds still describe land that way. Planning a fence or shed on a lot in Basin? Have a Montana licensed surveyor mark the corners first.
Finding vacant land and acreage in Jefferson County
A practical way to find vacant parcels near Whitehall:
- Zoom out over the countryside around Whitehall with the aerial layer on, and look for parcels with no structures.
- Check who owns each open tract near Boulder and where the tax bill goes.
- Make sure the parcel near Whitehall actually touches a public road, and ask how it's reached if it doesn't.
- Compare the record's land value against similar parcels on the same road out of Whitehall.
- For a tract near Basin, confirm zoning, septic suitability and flood status before you make an offer.
Hunting land and landowner permission in Jefferson County
Getting on private ground in Jefferson County is about relationships, and those start with the owner name on the parcel record. If you're hunting public ground like Deerlodge National Forest and Helena National Forest, use the parcel map to see where the public boundary meets private land. Licenses and season dates for the Jefferson City area come from the Montana Fish, Wildlife and Parks. Ask owners near Boulder early, ask politely, and send a thank-you after the season.
Where Jefferson County deeds and plats are kept
The map near Boulder is only as good as the deeds behind it, and those are kept in the county's recording office. Recording offices go by different titles from state to state, including register of deeds, recorder, county clerk and clerk of court; the official Jefferson County website names the one that handles deeds. If the Jefferson County parcel record shows an instrument number, that number is the shortcut to the recorded deed.
Near the county line
Jefferson County shares borders with Broadwater County, Deer Lodge County, Gallatin County, Lewis and Clark County, and Madison County, and each one runs its own parcel map and recording office. All of them are listed on our Montana page.
Common questions
Does Jefferson County have a plat book?
Whether a current printed edition exists for Jefferson County varies; the free online map covering Basin and the rest of the county is the dependable option.
Can I find the owner of a vacant lot in Jefferson County?
Look up the address in Whitehall, or click the tract. Owner names on the Jefferson County map come from recorded deeds.
How do hunters use the Jefferson County parcel map?
Use it to find the owner of a woodlot near Whitehall, then ask; the map itself grants no hunting rights.
How do I find property lines in Jefferson County, Montana?
For a lot in Whitehall, start with the parcel map, then get the recorded plat; a surveyor sets the exact corners.
Open the official Jefferson County, MT parcel map Jefferson County in the Platbookmapper directory
Not a survey. County GIS and tax parcel maps are assessment and planning layers. They are not a substitute for a recorded plat, deed, or licensed survey, especially for fences, setbacks, or boundary disputes.