Marshall County on the map of Illinois 2024. Cities, roads, borders and directions in Marshall County of Illinois.

Marshall County is found in the northern region of Illinois. This famous county was named after John Marshall (1755-1835), fourth and longest-serving Chief Justice of the United States. The population of Marshall County exceeds 12 thousand people. The county, organized in 1839, covers an area of 386 square miles. The county seat of Marshall County is Lacon. This map shows the borders of Marshall 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 Marshall County.