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County · code 30047

Lake CountyMontana

Lake County is a county in Montana with its seat in Polson, formed in 1923. The county was named after Flathead Lake.

  • Founded1923
  • County seatPolson
  • Named forFlathead Lake, Montana
  • Land area1,490 sq mi + 164 sq mi water
  • Population31,134 2020 Census
  • Parcels mapped23,717 checked 14 October 2026
Open the free map Click any parcel in Lake County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

MissoulaFlatheadSanders Polson Census outline · seat marked

Where it is

Lake on the map of Montana

Montana has 56 counties and county equivalents, each with its own records office. Shapes with a page are links.

Beaverhead CountyBig Horn CountyBlaine CountyBroadwater CountyCarbon CountyCarter CountyCascade CountyChouteau CountyCuster CountyDaniels CountyDawson CountyDeer Lodge CountyFallon CountyFergus CountyFlathead CountyGallatin CountyGarfield CountyGlacier CountyGolden Valley CountyGranite CountyHill CountyJefferson CountyJudith Basin CountyLewis and Clark CountyLiberty CountyLincoln CountyMcCone CountyMadison CountyMeagher CountyMineral CountyMissoula CountyMusselshell CountyPark CountyPetroleum CountyPhillips CountyPondera CountyPowder River CountyPowell CountyPrairie CountyRavalli CountyRichland CountyRoosevelt CountyRosebud CountySanders CountySheridan CountySilver Bow CountyStillwater CountySweet Grass CountyTeton CountyToole CountyTreasure CountyValley CountyWheatland CountyWibaux CountyYellowstone CountyLake County Lake
Counties of Montana · Lake highlighted

History

Formed in 1923 from Flathead County and Missoula County

An old deed may name a county that no longer exists, or a boundary that has since moved.

Lake County was created on August 10, 1923, by petition and election from Flathead County and Missoula County.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries.

  1. 1923
    Lake County created Lake created by petition and election from Flathead and Missoula.
    from Flatheadfrom Missoula
    · Mont. Laws 1923, 18th leg., pp. 623-627

Land and parcels

What the maps cover in Lake

Who publishes each layer, how good it is, and when we last checked.

Official
from the office that keeps the record
Good enough
a reliable statewide or national copy
Fallback
a guide only; check the official record
Missing
nothing public found yet

People and land

Lake by the Census

Population
31,134 2020 Census count
Housing units
16,390 2020 Census count
Land area
1,490 square miles
Water area
164 square miles
People per sq mi
21 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

Rules and offices

Lake County's official site

We have found the county's site but not its offices yet; start there.

County government

See your own lot on these maps

Open Lake County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.

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Questions

Common questions about Lake County

When was Lake County founded?
Lake County was founded in 1923, formed from Flathead County and Missoula County, and named after Flathead Lake, Montana.
What is the county seat of Lake County?
The county seat of Lake County is Polson.
Is there an online parcel map for Lake County?
Yes. A public source publishes a parcel map of 23,717 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Lake County's boundary or name changed?
Lake County was created in 1923 from Flathead County and Missoula County. The Atlas of Historical County Boundaries records no boundary change since.
Is my lot in a flood zone?
We do not have flood maps for Lake County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door