Environment
- 901
- Montana Chapter of the Sierra Club
- Environmental group includes groups in Bozeman, Missoula, Helena and Billings. Provides chapter information, news, events and alerts.
- 902
- Sierra Club North Star Chapter
- The Sierra Club North Star Chapter is Sierrans in and around Minnesota who enjoy outdoor activities.
- 903
- Hoosier Chapter Sierra Club
- Meetings, outdoor activities, environmental news and general information.
- 904
- Illinois Sierra Club
- News and information on legislation, issues, outings, membership and volunteering, plus links to local groups.
- 905
- Delaware Chapter of the Sierra Club
- Links to social events, canoe trips, picnics, and other outdoor activities. Also has information on conservation campaigns, including urban sprawl, water quality, and recycling.
- 906
- Loma Prieta Chapter of the Sierra Club
- Outdoor and environmental group. Serves San Benito, Santa Clara and San Mateo counties in California. Provides information and local activities.
- 907
- Redwood Chapter of the Sierra Club
- Outdoor recreation and environmental group covering northern coastal California from San Francisco to the Oregon border. Includes five regional groups: the Sonoma, Napa, Solano, Mendocino-Lake and the North Group. Provides information and local activities.
- 908
- San Diego Chapter of the Sierra Club
- Environmental activist and outdoor preservation group based in San Diego California. Provides information and local activities.