| Roy J Carver Charitable Trust | $28.6M | 156 | $95.9K |
| Charles E Lakin Foundation Inc | $26.6M | 73 | $11.8K |
| The Butler Family Foundation | $18.9M | 134 | $5K |
| Scanlan Family Foundation | $16.9M | 11 | $1M |
| The Geisler-penquite Foundation | $16.7M | 17 | $381.1K |
| Iowa West Foundation | $15.9M | 134 | $25K |
| The Gerdin Charitable Foundation | $12M | 16 | $525K |
| The Hall-perrine Foundation | $11.5M | 43 | $260K |
| Thomas & Linda Koehn Foundation | $10.1M | 52 | $55.6K |
| Krause Gentle Foundation | $7.3M | 44 | $1K |
| Otto Schoitz Foundation | $7.2M | 108 | $25K |
| Fred Maytag Family Foundation | $7.2M | 62 | $40K |
| John K and Luise V Hanson Foundation | $7.1M | 127 | $9K |
| Donald F &Charlene K Lamberti Foundation | $6.7M | 34 | $15K |
| Lauridsen Family Foundation | $6M | 48 | $50K |
| Alliant Energy Foundation Inc | $5.4M | 2,142 | $400 |
| Marie H Bechtel Charitable Trust | $5.2M | 79 | $30K |
| TrueNorth Legacy Foundation | $4.2M | 39 | $20K |
| The Seidler Foundation | $4.1M | 175 | $10K |
| John Ruan Foundation Trust | $4M | 52 | $10K |
| Sehgal Foundation | $4M | 66 | $2.5K |
| Better Health Foundation Melinda Gowey | $3.9M | 42 | $75K |
| Athene Charitable Foundation | $3.9M | 49 | $5K |
| Albaghdadi Family Medical Foundation | $3.9M | 14 | $4K |
| Van G Miller Family Charitable Foundation | $3.8M | 44 | $25K |
| Schwartz Family Foundation | $3.7M | 38 | $10K |
| Jensen Private Foundation Inc | $3.4M | 22 | $5K |
| Dean J King Family Foundation | $3.4M | 141 | $10K |
| Carlson Family Foundation | $3.3M | 67 | $40K |
| The Wellmark Foundation | $3.2M | 27 | $32K |
| Ottumwa Regional Legacy Foundation Inc | $3.1M | 216 | $1.1K |
| EMC Insurance Foundation | $3.1M | 214 | $5K |
| Carleen and Eugene Grandon Charitable Foundation | $3M | 52 | $35K |
| C Richard Stark Jr & Joan E Stark Foundation | $2.9M | 15 | $25K |
| The Carter Chapman Shreve Family Foundation | $2.9M | 26 | $50K |
| Lavern T Busse & Audrey Busse Foundation | $2.8M | 20 | $25.9K |
| The Rona and Jeffrey Abramson Foundation | $2.8M | 58 | $10K |
| Kent Corporation Charitable Foundation Fka Kent-stein Foundation | $2.7M | 40 | $10.5K |
| Tony Schneiderman Charitable Tr | $2.6M | 5 | $500K |
| Weiler Foundation | $2.6M | 118 | $1K |
| Harold R Bechtel Charitable Trust | $2.5M | 41 | $25.6K |
| The Noble Foundation C/o Claudia Miranda West Bank | $2.4M | 61 | $20K |
| Comfort Family Foundation | $2.3M | 26 | $10K |
| Ellen Glazer Ziegler Foundation | $2.2M | 8 | $142.7K |
| Max and Helen Guernsey Charitable Foundation | $2.2M | 125 | $16K |
| Arlan J Van Wyk Family Foundation | $2.2M | 61 | $10K |
| Tomson Family Foundation Trust | $2.1M | 156 | $5K |
| Meredith Corporation Foundation | $2.1M | 37 | $12K |
| HNI Charitable Foundation | $2.1M | 48 | $8.7K |
| R J Mcelroy Trust | $2.1M | 93 | $5K |
| John and Cindy Family Foundation | $2M | 21 | $100K |
| Ernst Family Foundation | $2M | 7 | $385K |
| Constance L French Charitable Foundation Trust | $2M | 6 | $275K |
| Pella Rolscreen Foundation C/o Pella Corporation | $1.9M | 433 | $1K |
| United Fire Group Foundation | $1.9M | 144 | $7.5K |
| Roland & Ruby Holden Foundation C/o Kristen J Wilcox | $1.9M | 6 | $242.6K |
| George F Murphy Perpetual Charitable Trust | $1.8M | 15 | $125K |
| Vermeer Charitable Foundation | $1.8M | 75 | $5K |
| Ochylski Family Foundation | $1.7M | 14 | $90K |
| Northeast Iowa Charitable Foundation | $1.7M | 26 | $47.1K |
| Perrin Foundation Inc | $1.7M | 39 | $17.5K |
| Swinmurn Family Foundation | $1.6M | 7 | $125K |
| The Gallagher Family Foundation | $1.6M | 60 | $10K |
| Kinney-lindstrom Foundation Inc | $1.6M | 96 | $6.9K |
| Beer Paul Tw | $1.6M | 12 | $6.5K |
| Versova Community Foundation | $1.5M | 91 | $2.5K |
| Bookey Family Foundation | $1.5M | 104 | $8K |
| Underwood Family Foundation | $1.4M | 104 | $5K |
| Kyle J & Sharon Krause Family Foundation | $1.4M | 55 | $3.2K |
| The Howe Foundation | $1.4M | 25 | $10K |
| Irving & Elizabeth Jensen Foundation | $1.4M | 5 | $10K |
| Edwin T Meredith Foundation | $1.4M | 19 | $10K |
| Mary K and Daniel M Kelly Family Foundation C/o Dan Kelly | $1.4M | 150 | $2.5K |
| Harman Family Charitable Tr Main | $1.4M | 19 | $38K |
| The Wlt Foundation | $1.3M | 11 | $50K |
| The Sukup Family Foundation | $1.3M | 11 | $50K |
| Herbert L and Nancy M Townsend Foundation | $1.3M | 8 | $17.5K |
| Evans Family Charitable Foundation | $1.2M | 37 | $25K |
| Perley Family Foundation | $1.2M | 5 | $40K |
| Michael L Peterson Foundation | $1.2M | 7 | $20K |
| Anderson Allene Charitable Trust | $1.1M | 9 | $124.2K |
| Myron J Walker Trust | $1.1M | 12 | $91.1K |
| Vogel Charities Inc | $1.1M | 14 | $875 |
| Beryl O and Wilma Sime Roundy Charitable | $1.1M | 18 | $53.3K |
| Leonard A Good Testamentary Trust | $1M | 48 | $12.3K |
| New Hope Foundation | $1M | 128 | $5K |
| Robert Griffith Charitable Trust | $1M | 12 | $52K |
| Martha Ellen Tye Foundation | $1M | 40 | $5K |
| The Denny and Candy Elwell Foundation | $1M | 116 | $5K |
| Pauline R Barrett Charitable Foundation | $1M | 17 | $25K |
| The Chesterman Family Foundation | $1M | 87 | $5K |