Darien Audubon Society: Organization overview, newsletter and information on field trips, special events, speaking programs, projects and birding areas.
Darien Environmental Group: Nonprofit volunteer organization established to educate residents about ways in which they can change consumer and lifestyle habits to benefit the environment.
Darien Land Trust: Land conservation agency which acquires and maintains areas of the town to be held as open space for the benefit of the community.
Friends of Cherry Lawn Park: Volunteer group of residents dedicated to preserving the public park.