| Name | Deductibility Code |
| Adult Day Health Care of Mad River | -- |
| Andree Wagner Peace Tr Utd 121289 | 4 |
| Arcata Childrens Center | -- |
| Arcata Community Recycling Center | -- |
| Arcata Downtown Business Community Incorporated | -- |
| Arcata Economic Development Corp | -- |
| Arcata House Inc. | -- |
| Arcata Interfaith Gospel Choir Inc. | -- |
| Arcata Little League & Babe Ruth League Inc. | -- |
| Arcata Vineyard Christian Community | -- |
| Arcata Volunteer Fire Department | 6 |
| Arcata Volunteer Fire Department Inc. | -- |
| Arcata-Camoapa Sister City Project | -- |
| Arts of Peace Inc. | -- |
| Associated Students of Humboldt State University | -- |
| Bamboo Bell | -- |
| Big Lagoon Charter Network | -- |
| Calvary Chapel of Arcata | -- |
| Catalyst Church Association | -- |
| Center for Environmental Economic Development | -- |
| Church of God 7th Day of Arcata | -- |
| Church of One | -- |
| Circus Remedy | -- |
| Coastal Grove Charter School | -- |
| Coastal Grove Charter School Parent Organization | -- |
| Companion Animal Foundation | -- |
| Connexus Communications | -- |
| Consortium for Education and Technology | -- |
| Consumer Credit Counseling Service of the North Coast | -- |
| Disabled Adventure Outfitters | -- |
| Ecoforestry Services for Farmers | 4 |
| Emma Center | -- |
| Energy and Resource Advocates | -- |
| Equinox Center for Education | -- |
| Eureka Symphony | -- |
| Exchange Club Center for Prevention of Child Abuse of Humboldt County | -- |
| Explore North Coast Inc. | -- |
| Falderal Musical Theater Co Inc. | -- |
| Fieldbrook Community Church | -- |
| Foundation for Integral Ecology | 4 |
| Friends of the Arcata Marsh | -- |
| Friends of the Dunes | -- |
| Fuente Nueva Charter School | -- |
| Full Circle Foundation for Integrated Medicine Inc. | -- |
| Girls Incorporated of the Redwood Coast | 4 |
| Godwit Days | -- |
| Greenwood Cemetery Association of Arcata Inc. | 6 |
| Hertha Elisabeth and Robert Moritz Solmitz Archive | -- |
| Historical Sites Society of Arcata Incorporated | -- |
| Humboldt Bay Housing Development Corporation | -- |
| Humboldt Community Breast Health Project | -- |
| Humboldt Educare Corporation | -- |
| Humboldt Folklife Society | -- |
| Humboldt Kinetic Association | -- |
| Humboldt Light Opera Company | -- |
| Humboldt Orchid Society | -- |
| Humboldt Plaza Corporation | -- |
| Humboldt State University Advancement Foundation | -- |
| Humboldt State University Center Board of Director | -- |
| Humboldt State University Sponsored Programs Foundation | -- |
| Humboldt Timberwolves | -- |
| Humboldt Wildlife Care Center | -- |
| Institute for Wildlife Studies | -- |
| Internews Network | -- |
| La Vida Education Inc. | -- |
| Lost Coast Aviators Eaa Chapter 1418 Incorporated | -- |
| Mad River Community Hospital Volunteers | -- |
| Mad River Girls Fastpitch Softball Association | -- |
| Mad River Montessori Preschool | -- |
| Mad River Youth Soccer League Inc. | -- |
| Me Dil Institute | -- |
| Mountain Top Christian Fellowship Inc. | -- |
| New World Youth Ballet | -- |
| North Coast Resource Center | -- |
| North Coast Stand Down | -- |
| Northcoast Aikido Foundation | -- |
| Northcoast Childrens Services Inc. | -- |
| Northcoast Enviromental Center | -- |
| Northcountry Clinic | -- |
| Open Door Community Health Centers | -- |
| Pacific Coast Fish Wildlife and Wetlands Assoc | -- |
| Pita Hall of Fame | -- |
| Playhouse Arts | -- |
| Queer Humboldt | -- |
| Redwood Coast Institute | -- |
| Redwood Coast Junior Golf Association | -- |
| Redwood Curtain Consortium | -- |
| Redwood Environmental Education Institute | -- |
| Redwood Jazz Alliance | -- |
| Redwood Peace and Justice Center | -- |
| River Community Homes Inc. | -- |
| Rotary Club of Arcata Sunrise Community Foundation | -- |
| Running With Scissors | -- |
| Seventh Generation Fund for Indian Development Inc. | -- |
| Siskiyou Land Conservancy | -- |
| Soul First | -- |
| Streamways | 4 |
| Sustainable Energy Institute | -- |
| The Pacific Seabird Group | -- |
| The Roshni Centre for Women | -- |
| Trillium Charter School | -- |
| Trinity Institute for Alternative Technology and Research | -- |
| Union Street Charter | -- |
| United Indian Health Services Inc. | -- |
| United States Servas Inc. | -- |
| Victory Life Fellowship | -- |
| Vietnam Friendship Village Project USA Inc. | -- |
| Watts Prophets Community Education Association Inc. | -- |
| Wisdom of the Heart Church | -- |
| World Shelters | -- |