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

Williamson County is found in the southern section of Illinois. This famous county was named after Williamson County, Tennessee, which was named for Hugh Williamson. The population of Williamson County exceeds 67 thousand people. The county, organized in 1839, covers an area of 420 square miles. The county seat of Williamson County is Marion. This map shows the borders of Williamson 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 Williamson County.