| Name | Deductibility Code |
| Marathon Area Swim Association Inc. | -- |
| Marathon School District Foundation Special Projects Fund Inc. | -- |
| Marth Foundtion Ltd. | 4 |
| New Life Pet Adoption Center Inc. | -- |
| North Central Wisconsin Antique Steam and Gas Engine Club Inc. | -- |
| Raymond and Marie Goldbach Foundation Inc. | 4 |
| Sonnentag Foundation Ltd. | 4 |