| Name | Deductibility Code |
| Community Chest of Marengo Iowa Inc. | -- |
| Friends of the Marengo Public Library | -- |
| Hope Luncheon | -- |
| Iowa County Council for the Prevention of Child Abuse | -- |
| Iowa County Historical Society | -- |
| Iowa Valley Community School District Foundation | 4 |
| Koszta Church of God in Jesus Christ | -- |
| Marengo Memorial Hospital | -- |
| Marengo Memorial Hospital Foundation | -- |
| Marengo Picnic in the Park Inc. | -- |
| Refuge Inc. | -- |
| Rex & Christine Bishop Perpetual Schlshp Fd for Ia Valley Cmty Sch | 4 |