Montana County Maps

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Jefferson County, Montana

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Jefferson County, Montana Map

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An detailed map of Jefferson County. Click on a nearby County to view more information about that County.

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Map of Counties in Montana

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An interactive map of Counties in Montana. Click on a County to view more information about that County.

About Jefferson County, Montana

Jefferson County is a county in Montana, United States. As of the 2020 census, the population was 12,085. Its county seat is Boulder. The county was created in 1865 and named for President Thomas Jefferson.

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This site has an interactive map of Montana Counties. Click on the map to find your Montana county, and view more details. You can also search for your address and use your GPS to find your Montana County.

Find what County you are in, and see official Montana County resources and information. Find any county in the United Stated, along with resources and links to official County websites. See a County map and local details. Looking for what county you are currently in? Find out on this map or use your device GPS to see what county you are in.