Illinois Sierra Club, Prairie Group
- Newsletter plus meetings, calendar, committees, reports, outings and contact information.
- http://illinois.sierraclub.org/Prairie/

Illinois Sierra Club, Blackhawk Chapter
- Members of the board and roster of officers, legislation, news and advocacy information.
- http://illinois.sierraclub.org/Blackhawk/

Illinois Sierra Club, Piasa Palisades Group
- News, group history, local river issues, group directory, alerts and information on programs and activities.
- http://illinois.sierraclub.org/PiasaPalisades/

Illinois Sierra Club, Kaskaskia Group
- Form members in the counties of St. Clair, Monroe, Randolph, Washington, Clinton, Marion and Jefferson.
- http://illinois.sierraclub.org/kgroup/

Illinois Sierra Club, Shawnee Group
- An activist organization with members working on local issues such as natural areas management; endangered species, biodiversity and wilderness preservation.
- http://illinois.sierraclub.org/Shawnee/

Illinois Sierra Club
- News and information on legislation, issues, outings, membership and volunteering, plus links to local groups.
- http://illinois.sierraclub.org/