Kitten Rescue of Mason County
- A non-profit adopting abandoned and homeless kittens and cats to safe, loving homes.
- http://kittenresq.net/

Volunteer Center of Lewis, Mason, and Thurston Counties
- They dispatch emergency volunteers, collaborates on community projects, and matches volunteers with agencies.
- http://www.volunteer.ws/

Mason County Emergency Communications
- Provides information about volunteer radio communications clubs meeting in Belfair and Shelton.
- http://www.wwa-district3-ares.org/mason_county/

Mason Benson Club
- A non-profit organization of residents of Mason or Benson Lakes or individuals who use property at one of the lakes.
- http://www.masonlake.us/

Mason County Senior Activities Association
- Provides Mason County's senior citizens with events, activities, companionship, food service, and referrals.
- http://www.mcsaa.org