The Lake County Courthouse, Lake County Montana
The Lake County Courthouse
Flathead Lake Montana
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Lake County Montana
Lake County Plat Room

How to contact us:

106 Fourth Avenue East
Polson, MT 59860
Phone: (406) 883-7213
Phone: (406) 883-7212 ~ GIS - Call for addressing questions
Fax: (406) 883-7283

Hours: Monday thru Friday, 8:00 a.m. – 5:00 p.m.

The Plat Department maintains surveys recorded in Lake County, including:

• Certificates of Survey (COS’s)
• Subdivision Plats
• Minor Subdivision Plats (SP’s)

We also maintain the history of property transfers in plat books, filed by section, township, and range or by subdivision name. Section maps in the plat books are updated each time a property boundary changes and are maintained in both hard copy and digital form. All Survey plats can be found here

Property boundary changes are updated on the computer by the GIS Department and transferred quarterly to the Montana Information Technology Services Division’s Cadastral Mapping Project. The ITSD maintains a website of our parcel data which is linked to property appraisal records (CAMA data) from the Montana Department of Revenue. If you would like to research current property ownership via the Internet, go to  .

Additional maps are available from the plat office, including maps of:
• Incorporated cities in Lake County (Polson, Ronan, and St. Ignatius)
• Zoning districts
• School districts
• Voting precincts
• Fire districts
• Herd districts
• Public roads
• Montana Department of Transportation highway right-of-way plans
• Density Map

Prices for our hard copy maps are here

Many historical records are filed in the plat department, such as:
• General Land Office survey plats
• Deed exhibits
• Homestead entry surveys (HES)
• Survey corner records

Records filed with surveys are available in our office, including:
• Montana DEQ certificates of plat approval
• Restrictive covenants for subdivisions
• Easements
• Jfiles

Due to the volume of assistance requests and legal issues, our office can not research property title for easements, but instead refer customers to the local abstract and title companies in Lake County. We will be happy to train the public how to use the public computer in our office for research.

Local administrative boundaries are maintained digitally by the GIS department and are available upon request. A wide variety of GIS data for Lake County can be downloaded from the Montana State Library Natural Resource Inventory System (NRIS) website at:

NRIS also maintains an interactive mapping website at  where users can view topographic maps and digital orthophotos (where available).


Section Maps (18 x 24) $3.00
COSs (18 x 24) $3.00
Subdivision Plats (24 x 36) $5.00
Lake County Road Maps $8.00
Document Copies $ .50 1st page
$ .25 addition pages
Letter size color print $1.00

* Shipping Charges will be applied for mailed items*

GIS Department Fee Schedule

GIS custom map per hourly state employee market rate MC2-6-110


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All information posted on this website is deemed correct at the time of posting.
Please contact the department head for complete and current information.
Montana photographs on this website are provided by and used with permission under licensing agreement.