Jefferson County on the map of Montana 2024. Cities, roads, borders and directions in Jefferson County of Montana.

Jefferson County is located in the western area of Montana. This respectable county is named after Thomas Jefferson (1743-1826), the third President of the United States. The county seat of Jefferson County is Boulder. The county's area is about 1657 square miles. Founded on February 2, 1865, today Jefferson County is home to 12 thousand residents. This map shows the borders of Jefferson County as well as neighboring counties, including major highways and natural objecsts as of 2024. Zoom in or out of the map using the plus/minus panel. Move the center of this map by dragging it. Also check out the satellite map of Jefferson County.