| Name | Deductibility Code |
| Hospice of Humboldt County | -- |
| Humboldt Area Arts Council | -- |
| Humboldt Community School Education Foundation | -- |
| Humboldt County Fair Foundation | -- |
| Humboldt County Historical Association | -- |
| Humboldt County Housing Development Corp | -- |
| Humboldt County Memorial Hospital Foundation | -- |
| Humboldt Dakota City Senior Citizens Center Inc. | -- |
| Humboldt Friends of the Parks | -- |
| Humboldt Ragbrai 2007 Inc. | -- |
| Humboldt Wildcat Wrestling Club | -- |
| Indian Mound Cemetery Association Incorporated | 6 |
| John Dodgen Foundation | 4 |
| Learn and Play Childcare Inc. | -- |
| Mid-West Tool Collectors Association Inc. | -- |
| North Central After Care | -- |
| Prairie Partners Rc&D Area Inc. | -- |
| River Development Inc. | -- |
| West Fork Services Inc. | -- |
| West River Recreation Center Inc. | -- |