Blog · October 14, 2026 · Montana
Chouteau County Plat Book, Montana: what to know
If the land is near Big Sandy, plat books show ownership by township; the parcel viewer shows it today.
Main page: Chouteau County, MT GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Looking for a Chouteau County plat book? It's a printed atlas of landownership, usually by township, useful for farms near Loma. This county guide covers: what's in a plat book, where to look for printed copies, and the free online map that stays current around Marias River.
Getting started with the Chouteau County plat book
For a tract near Missouri River, a plat book is a privately published atlas, that map ownership across the countryside, usually township by township.
Opening the official parcel viewer
Begin with the Montana Cadastral; it maps each tax parcel around Boneau and Marias River. If you only know roughly where the land is, follow the nearest road on the aerial until the lines appear, then click inside the one you want, for land near Geraldine included. For a home near Carter, the record panel usually lists the owner of record, assessed acreage, a parcel ID and often a sale date.
Who handles what
Anything recorded against property around Geraldine come from the County Clerk and Recorder, usually searchable by name or document number. Questions about what you can build around Boneau need the planning or permitting office, town or county, depending on location.
Printing your own
Screenshot each section of the viewer around Boneau and keep them in a binder for the truck.
Deeds, plats and who keeps them
Before you sign anything, get the recorded deed from the County Clerk and Recorder; the viewer just points to it, and that holds around Big Sandy too. With a lot near Teton River, bring the book and page listed on the parcel record and the lookup takes minutes.
Why people still buy them
Buyers and seed dealers around Carter rely on them to see ownership across many tracts at once.
Editions and availability
Older editions near Highwood turn up in libraries and historical societies, useful for family or title research.
Limits of the parcel data
Acreage on the record is an assessed number; just a licensed surveyor can set the real corners for a parcel near Teton River. For property near Loma, owner names and values update on a schedule, so a deed recorded last month can take weeks to appear.
Field tips
The parcel map usually runs in a mobile browser, useful out on a road near Big Sandy, though signal can drop in rural spots. A saved image of the lot near Floweree and its lines is a good backup.
Using the parcel viewer instead
Between printed editions, the Montana Cadastral shows current owners, across the county, for land near Loma included.
Chouteau County in a few facts
Fort Benton is the county seat, home to the main records offices. You'll also find Big Sandy, Geraldine, Boneau, and Carter, each with its own cluster of lots. Roughly 5,847 people call Chouteau County home (Census Bureau estimate, 2023) spread over about 3,973 square miles. Chouteau County dates to 1865, which matters when you trace an old farm's title. Places such as Teton River, Marias River, and Lewis and Clark National Forest help you orient on the aerial.
Legal descriptions in Montana
Montana uses the Public Land Survey System, so deeds around Big Sandy reference sections and townships. Each section is nominally a mile square, about 640 acres, and a township holds 36 of them, though real sections near Teton River vary in size. Copy the legal description from the record for the parcel near Floweree when you talk to a surveyor.
Not the same thing
For a parcel near Highwood, don't confuse the atlas with a recorded subdivision plat: the recorded plat at the County Clerk and Recorder is a legal document, while the atlas is a reference.
When a parcel crosses a boundary
Chouteau County meets Blaine County, Cascade County, Fergus County, Hill County, and Judith Basin County, all with their own assessor records. Ground near Carter that runs to the line may be split across two assessors' files, so open the adjacent map as well. For a tract near Big Sandy, our state page links each bordering county map across Montana.
Chouteau County: common questions
Is a plat book the same as a recorded plat around Marias River?
Closer to Loma, a survey sets boundaries, not an atlas.
Is there a current Chouteau County plat book?
With a lot near Big Sandy, editions come and go; online parcel maps fill the gaps.
Why does the plat book differ from the deed around Missouri River?
Good question; atlas drawings near Floweree are simplified.
Are old plat books online in Chouteau County?
With a lot near Floweree, libraries and historical societies hold older editions.
Where do I ask about an assessment near Carter?
If the land is near Boneau, values are the Montana Department of Revenue's job; recorded documents belong to the County Clerk and Recorder.
Open the official Chouteau County, MT parcel map See it 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.