| Name | Deductibility Code |
| Allen and Ellen M Blessman Family Foundation | 4 |
| First Christian Church | -- |
| Illini Central Community Unit School District 189 | -- |
| Mason City Area Library Foundation | -- |
| Mason City Area Nursing Home Association 129 E Chestnut | -- |
| Mason City Cemetery Association | 6 |
| Mason City Community Daycare Inc. | -- |
| The Cell Inc. | -- |