Sierra Club River Prairie Group
- An organization that promotes conservation of the natural environment by influencing public decisions. Contains newsletter, events, membership, and related resources.
- http://illinois.sierraclub.org/rpg/

First Environmental Laboratories, Inc.
- Details of facilities and equipment, quality assurance, accreditation list, glossary, staff and sample policies, from lab serving government and consultants for analyses at Naperville, IL.
- http://www.firstenv.com/

Naperville Astronomical Association
- A non-profit astronomy club with a membership of over two-hundred individuals and families. Includes information on membership, activities and events, links and contacts.
- http://www.stargazing.net/naa/