Cities in Jefferson County, Montana by Population (2024)

There are 21 cities in Jefferson County, Montana.

Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)

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City
Rank
2024 Population
2020 Population
Annual Change
Density (/mi²)
Area (mi²)
Type
Butte-Silver Bow136,07734,5731.05%50715.8Township
Anaconda-Deer Lodge County29,7579,4200.87%13736.7Township
Helena Valley Southeast39,5658,5461%44621.5CDP
Montana City42,7162,8210%8034.1CDP
East Helena52,2011,9482.95%5434.1City
Clancy62,0221,9641.3%5239.2CDP
Three Forks71,9871,9820.05%1,3811.4City
Boulder81,3081,2061.95%1,1641.1City
Whitehall91,1041,0082.22%1,5660.7Town
Wheatland101,0926363.6%1574.5CDP
Ponderosa Pines119254204.76%2339.6CDP
Walkerville126666371.06%2992.2Town
South Hills136485861.57%1105.9CDP
Spokane Creek145394382.47%3117.3CDP
Jefferson City154815960%2123.2CDP
Rader Creek164072950.74%2020.3CDP
Basin173892673.18%3112.7CDP
Willow Creek182112160%772.7CDP
Elkhorn195707.55%86.7CDP
Cardwell20561077.69%262.1CDP
Mammoth212105%600.3CDP

Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.

What is the largest city in Jefferson County, Montana?

Butte-Silver Bow is the largest city in Jefferson County.

What is the smallest city in Jefferson County, Montana?

Mammoth is the smallest city in Jefferson County.

How many cities are in Jefferson County?

There are 21 cities in Jefferson County, Montana.

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