Rotary Club of Darien
- Club history, newsletters, photo gallery, and information on meetings and membership.
- http://rotary.darien.org/

Kiwanis Club of Darien
- Local chapter of service organization affiliated with Kiwanis International.
- http://kiwanis.darien.org/

Darien Technology Foundation
- Founded to increase the financial resources for technology in the community by providing grants to the public schools, library, senior citizens' groups and other organizations.
- http://www.darientechnologyfoundation.org/

Darien Community Association
- Not-for-profit that provides educational, cultural, recreational and civic programs.
- http://dca.darien.org/

Darien Book Aid Plan, Inc.
- Not-for-profit volunteer organization that accepts donations of books for free distribution.
- http://dba.darien.org/