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

Johnson County is located on the southern edge of Illinois. This remarkable county was named after Richard Mentor Johnson (c. 1780-1850), ninth Vice President of the United States and United States Senator from Kentucky. The county seat of Johnson County is Vienna. The county's area is 343 square miles. Established in 1812, today Johnson County is home to 13 thousand americans. This map shows the borders of Johnson 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 Johnson County.