| Name | Deductibility Code |
| Aspirus Ontonagon Hospital Inc. | -- |
| Citizens for Ontonagon Memorial Hospital | -- |
| Finnish Apostolic Lutheran Church of Woodspur | -- |
| Friends of the Porcupine Mountains Wilderness State Park | -- |
| Ontonagon Area Scholarship Foundation | -- |
| Ontonagon Christian Centre | -- |
| Ontonagon County Animal Protection Inc. | -- |
| Ontonagon County Historical Society | -- |
| Ontonagon County Veterans Association | 6 |
| Ontonagon Theater of Performing Arts Inc. | -- |