Current seat holder: Adriane Johnson.
Adriane Johnson is the incumbent Democratic member of the Illinois State Senate representing District 30, having assumed office in October 11, 2020, and is running unopposed for re-election in the November 3, 2026 general election. At the time of her appointment, Johnson was serving as board president for the Buffalo Grove-Lincolnshire Chamber of Commerce. She was also serving as chair of the Illinois Association of Park Districts' Board of Trustees and had been a Buffalo Grove parks board member since 2011.