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

Jefferson County is located on the eastern edge of Missouri. This cool county is named after Thomas Jefferson (1743–1826), third President of the United States, principal author of the Declaration of Independence. The county seat of Jefferson County is Hillsboro. Formed in 1818, today Jefferson County is home to 228 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.