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List of Montana Counties by Population and Size (+Map)

Montana is undoubtedly one of the most underrated states in the country. From towering, snowcapped mountains to placid and glass-like lakes (and most importantly, wide open plains and prairies) – Montana has it all. 

Like all other states, Montana is divided up into counties, with 56 individual counties making up the entirety of the state. 

Each county is unique and varies in size and population, and you will find that locals are very proud of their area! 

This guide covers each county in Montana and provides you with all the information you need at a glance, including:

  • Country formed
  • Population
  • Area size

And more. Let’s get into it!

Jump to: Counties in Montana By Population and Size

Counties in Montana

Montana Counties Map
Montana Counties Map

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The Counties in Montana By When It Was Formed, Size and Population

Here is a breakdown of each county and all the essential information you need to know!

Data source:  2022 census conducted by the U.S. Census Bureau

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CountyFormedAreaPopulation (2022)Population (2021)Change
Beaverhead18655,572 sq mi9,7199532+187
Big Horn19135,015 sq mi12,85112932-81
Blaine19124,239 sq mi6,9366982-46
Broadwater18971,239 sq mi7,7937323+470
Carbon18952,062 sq mi11,17910862+317
Carter19173,348 sq mi1,3821410-28
Cascade18872,711 sq mi84,86484498+366
Chouteau18653,997 sq mi5,8985916-18
Custer18653,793 sq mi12,03211971+61
Daniels19201,426 sq mi1,6281669-41
Dawson18702,383 sq mi8,8308866-36
Deer Lodge1865741 sq mi95109506+4
Fallon19131,623 sq mi3,0112984+27
Fergus18854,350 sq mi11,66311609+54
Flathead18935256 sq mi111,814108725+3,089
Gallatin18652632 sq mi124,857123051+1,806
Garfield19194,847 sq mi12,181210+8
Glacier19193,037 sq mi13,68113743-62
Golden Valley19201,176 sq mi`835818+17
Granite18931,733 sq mi3,5023355+147