Democracy Unlimited of Humboldt County
- Organized to promote grassroots strategies that exercise democratic power over corporations. Provides information about issues and events.
- http://duhc.org/

Humboldt County Genealogy
- From GenWeb, extensive data base for genealogy search in the county.
- http://cagenweb.com/humboldt/

Arcata/Humboldt County Greens
- Green Party of Humboldt County
- http://www.cagreens.org/humboldt/

Four H Humboldt County
- Includes meetings, activities and projects for 4H-ers in the county.
- http://cehumboldt.ucdavis.edu/4-H_Program/

The Humboldt Amateur Radio Club
- Established for the promotion of amateur radio communications.
- http://www.humboldt-arc.org/

League of Women Voters of Humboldt County
- Information for voters on the local Humboldt County and national levels. Links to sites for voters.
- http://www.lwvhc.org/vote/

Humboldt Habitat For Humanity
- Local chapter of the nonprofit organization dedicated to building affordable housing for families in need.
- http://www.humboldthabitat.com/

Northcoast Environmental Center (NEC)
- The NEC, created in February 1971, is one of the most influential and certainly the oldest coalition: educating, agitating and litigating on behalf of the environment in the Klamath~Siskiyou region of northwestern California.
- http://necandeconews.to/

Mountain Lion Foundation
- Non-profit conservation and education organization founded in 1986, dedicated to protecting the mountain lion, its wild habitat and the wildlife that shares its habitat -- for present and future generations throughout California and the West.
- http://www.mountainlion.org/

Forests Forever
- Our Mission: To protect and enhance the forests and wildlife habitat of California through educational, legislative and electoral activities. Second, our Mission is to recruit, educate and train articulate and effective organizers in the skills needed to
- http://www.forestsforever.org/

Save-the-Redwoods League
- Save-the-Redwoods League has practiced its unique approach to conserving California's redwood forest land since 1918. We buy land from willing sellers using private donations, and donate this land to one of the California Redwood State Parks, other public
- http://www.savetheredwoods.org/