| Authenticity Book House IncWinterset | Form 990-N | No figure |
| Boone County Historical SocietyBoone | Form 990-N | No figure |
| Muskie Football Club IncMuscatine | Form 990-N | No figure |
| Slater Community ClubSlater | Form 990-EZ | $44,113FY2024 |
| Cherokee Community TheatreCherokee | Form 990-N | No figure |
| Marshalltown Football LeagueMarshalltown | Form 990-EZ | $43,607FY2025 |
| Quasqueton Area Historical SocietyQuasqueton | Form 990-N | No figure |
| Cascade Band BoostersCascade | Form 990-EZ | $42,708FY2025 |
| Clinton County Historical SocietyClinton | Form 990-N | No figure |
| Union County Historical SocietyCreston | Form 990 | $41,868FY2025 |
| PTA Iowa CongressAltoona | Form 990-EZ | $41,489FY2025 |
| Pioneer Museum & Historical Society of North IowaMason City | Form 990-EZ | $40,277FY2025 |
| Peace Haven Endowment CorporationWalnut | Form 990-N | No figure |
| Oskaloosa Band Boosters IncOskaloosa | Form 990-EZ | $39,987FY2025 |
| Mepo Athletic Booster Club IncBurlington | Form 990-N | No figure |
| Grape Hospital FoundationHamburg | Form 990-N | No figure |
| Adair County Historical Society IncGreenfield | Form 990-N | No figure |
| Storm Lake Public Library Gallery Guild IncStorm Lake | Form 990-N | No figure |
| Sibley Band BoostersSibley | Form 990-EZ | $35,893FY2026 |
| Davis County Trails CouncilBloomfield | Form 990-N | No figure |
| Crossroads Park Elementary PTAWest Des Moines | Form 990-N | No figure |
| Handicapped Development Center AuxiliaryDavenport | Form 990-EZ | $34,991FY2025 |
| Village Housing IncSheldon | Form 990-N | No figure |
| Gracepoint FoundationDubuque | Form 990-N | No figure |
| American Planning AssociationDes Moines | Form 990-EZ | $32,453FY2025 |
| Southdale I M P A C TCedar Falls | Form 990-N | No figure |
| Cady Learning Center FoundationDes Moines | Form 990-N | No figure |
| Auxiliary of Montgomery County Memorial HospitalRed Oak | Form 990-EZ | $28,936FY2025 |
| Clear Lake Youth Athletic League IncorporatedClear Lake | Form 990-N | No figure |
| First Lutheran Church Charitable TRBritt | Form 990-N | No figure |
| Fremont County Historical Society IncSidney | Form 990-N | No figure |
| Quad Cities Interfaith Sponsoring CommitteeDavenport | Form 990-N | No figure |
| Sunshine Circle of Finley HospitalDubuque | Form 990-EZ | $26,039FY2025 |
| PTA Iowa CongressBettendorf | Form 990-EZ | $25,861FY2026 |
| Nevada Community Historical Society IncNevada | Form 990-N | No figure |
| Izaak Walton League of America IncNorthwood | Form 990-N | No figure |
| A B Caine Educational FoundationWaukee | Form 990-N | No figure |
| Sac County Conservation FoundationSac City | Form 990-N | No figure |
| PTA Iowa Congress PTAWest Des Moines | Form 990-N | No figure |
| PTA Iowa CongressBettendorf | Form 990-EZ | $23,959FY2025 |
| Pharmacists Mutual Foundation IncAlgona | Form 990-N | No figure |
| National Pork Industry FoundationDes Moines | Form 990-N | No figure |
| Dubuque County Conservation Society IncPeosta | Form 990-N | No figure |
| The Riders ClubDes Moines | Form 990-N | No figure |
| Ogden Community Scholarship FoundationOgden | Form 990-N | No figure |
| Birthright of Black Hawk CountyCedar Falls | Form 990-N | No figure |
| Johnson County Interfaith CoalitionIowa City | Form 990-N | No figure |
| Mamie Doud Eisenhower Birth Place Foundation IncBoone | Form 990-N | No figure |
| Davenport Jaycees FoundationDavenport | Form 990 | $21,538FY2025 |
| Little League Baseball IncOttumwa | Form 990-EZ | $21,419FY2025 |