- Science Tech And CodingBay Area Zig User GroupUser group for Zig programming language enthusiasts in the San Francisco Bay Area.
- Sports Wellness And RecreationBayLax Women's Lacrosse LeagueBayLax is the San Francisco Bay Areas only non-profit Women Lacrosse club.
- Games And TabletopBayLUG - Bay Area LEGO Users GroupBay Area LEGO user group for adult fans and builders, including displays, meetings, and community activity.
- Science Tech And CodingBAY-NETBay Area amateur radio group focused on repeaters, emergency communications, and regional ham community.
- Sports Wellness And RecreationBelmont RunnersEstablished to promote fitness and foster community relationships through running; a local group (most members between San Mateo and Redwood City) meeting several times a week for casual group runs, open to all fitness levels. 501(c)(4) nonprofit and RRCA member.
- Outdoors And AdventureBenicia Bicycle ClubClub organizing regular group rides (A and B pace groups) around Benicia, Solano County and the greater Bay Area, including the semiannual Moxie ride.
- Social And MeetupsBenicia Friendship ClubMeet people, socialize, make new friends, and support charities and scholarships - with outings to restaurants and plays, potlucks, book clubs, bunco, card games, Mexican Train, a walking group, and more.
- Outdoors And AdventureBenicia Outrigger Canoe ClubOutrigger canoe club paddling the Carquinez Strait; Saturday open practices welcome keiki (10+) and parents, with a modified less-intensive practice option.
- Yacht ClubBerkeley Yacht ClubBerkeley Yacht Club was established in 1939 to develop and promote aquatic sports, and we welcome everyone interested in being out on the water. We pride ourselves on being a volunteer club and a strong community where everybody pitches in to help maintain the clubhouse and assist with events.
- Science Tech And CodingBioCuriousCommunity biotech lab and technical library for entrepreneurs, citizen scientists, hobbyists, activists, and students.
- Arts And CraftsBlack Sheep Handweavers GuildHandweaving and fiber arts guild with meetings, learning, and community for fiber artists.
- Books And WritingBooks Inc. Book ClubsBooks Inc. offers a wide range of book clubs for all ages and interests, including genres like contemporary fiction, social justice, romance, and speculative fiction. Groups meet regularly at various locations and online to discuss selected titles and share a love of reading.
- Books And WritingBooks on Tap (Springstowne Library Book Club)Solano County Library's Springstowne Library book club that meets at the Mare Island Brewery Ferry Taproom to discuss monthly book themes.
- Social And MeetupsBridges Social ClubProfessional women’s community with curated events, networking, and member connection.
- Social And MeetupsBurlingame Parents' ClubEmpowers families with children from birth to age six by fostering a nurturing community that offers support, valuable resources, and lasting friendships; welcomes families from all over the Peninsula.
- Social And MeetupsBurlingame Woman's Club (BWC)Burlingame Woman's Club (BWC) is a group of women from Burlingame and surrounding towns who gather for fellowship and to support the community through service and philanthropy.
- Nature Gardens And FarmsCalifornia Horticultural SocietyBay Area horticultural society with membership, lectures, plant knowledge, and gardening community.
- Nature Gardens And FarmsCalifornia Native Plant SocietyProtecting California's native flora through science, education, conservation, and gardening.
- Science Tech And CodingCalifornia Native Plant Society - East Bay ChapterCNPS East Bay chapter covering Alameda and Contra Costa counties, with speaker programs, field trips, restoration projects, native plant gardening resources, conservation advocacy, and a rare plants program.
- Arts And CraftsCalifornia Watercolor AssociationWatercolor association offering monthly meetings, workshops, member shows, outreach, and an annual International Exhibition (57th in 2026).
- Books And WritingCalifornia Writers Club - Bay Area BranchesUmbrella row for Bay Area branches of the California Writers Club, avoiding one row per branch.
- Games And TabletopCarquinez Model Railroad SocietyModel railroad society with layouts, events, and railroad modeling community.
- Sports Wellness And RecreationChai and MilesChai and Miles is a space for South Asian individuals to meet and run.
- Sports Wellness And RecreationCherry City BowmenAn archery club promoting target and field archery, with a range located in San Leandro.
- Culture And LanguageCIAO Bay AreaItalian cultural/community organization connecting people through Italian language, culture, and events.