- Sports And RecreationSolano Community Tennis Association (SCTA)A 501(c)(3) community tennis association founded in 2021 to promote and develop the growth of tennis in northern Solano County (dba Northern Solano County Racquet Association); supports USTA adult league play at Centennial Park, a Pickleball Division (dba Vacaville Pickleball), and GO Solano youth programs.
- Fitness And WellnessSolo SierransThe Solo Sierrans, a section of the San Francisco Bay Chapter of the Sierra Club, offer fun, friendship, and an opportunity to participate in a variety of outdoor activities. We are singles who care about each other and our environment.
- Arts And CraftsSOMArts Cultural CenterSOMArts leverages the power of art as a tool for social change through multi-disciplinary events and exhibitions. Equipping artists with the space, mentorship and support they need to shift perspectives and innovate solutions to today’s pressing challenges, SOMArts fosters access to arts and culture for collective liberation and self-determination.
- Sports And RecreationSonoma County Adult Coed Soccer LeagueRecreational outdoor coed soccer league for adults in Sonoma County (men over 30, women over 18); season runs March through end of June with Saturday games at Galvin and Trione parks and Santa Rosa/Piner high schools.
- Science Tech And NatureSonoma County Beekeepers AssociationSCBA supports Sonoma County residents interested in honey bees, beekeeping, pollinator habitat, and community, with educational activities, a swarm-rescue program, and a newsletter.
- Books And WritingSonoma County Genealogical SocietyThe purpose of this Society is to educate the general public and members in genealogical research, and to preserve, collect, compile, publish and disseminate genealogical data and family history. Publishes the Sonoma Searcher.
- Science Tech And NatureSonoma County Mycological Association (SOMA)The Sonoma County Mycological Association (SOMA) is a non-profit group dedicated to learning about local mushrooms and fungi, supporting mycological research through scholarships and educating the public. Hosts forays, SOMA Camp, and a Mushroom Art Fair.
- Sports And RecreationSonoma County Pickleball ClubOrganizes drop-in pickleball play at public courts throughout Sonoma County, including daily 9am drop-in at Finley Park and afternoon play at Howarth Park in Santa Rosa, plus locations in Petaluma, Windsor, Rohnert Park, Healdsburg, Sebastopol and more.
- Science Tech And NatureSonoma County Radio AmateursSonoma County ham radio club holding monthly membership meetings with programs of interest to hams, VE license exam sessions, repeaters, and ARRL Field Day participation.
- Food And DrinkSonoma County Women's Wine Club (SCWWC)Group for women in Sonoma County who enjoy networking, socializing, and drinking wine, meeting monthly at local wineries, small businesses, and restaurants. Must be 21+ to join.
- Books And WritingSonoma Reads! Book ClubMeets the fourth Thursday of the month from 2-3 pm. Pick up a copy of each month's book at the Sonoma Valley Branch while supplies last. Then, please come and discuss it with us.
- Fitness And WellnessSonoma Splash Masters SwimmingMasters swim team at Sonoma Splash's aquatic center welcoming brand new swimmers, returning swimmers, and regulars who want to work out with a group; coached by USMS-certified coaches; offers a 'Masters 101' intro class.