| Sigma Lambda Beta Education Foundation IncCedar Rapids | Form 990 | $342,962FY2025 |
| Norwalk Athletic Booster ClubNorwalk | Form 990 | $316,633FY2025 |
| Build Lincoln Higher Booster ClubDes Moines | Form 990 | $315,321FY2026 |
| River King & Queen Athletic Booster ClubClinton | Form 990 | $314,470FY2025 |
| Convivium Urban FarmsteadDubuque | Form 990 | $313,534FY2025 |
| Glenwood Booster ClubGlenwood | Form 990 | $313,507FY2025 |
| Cherokee Educational FoundationCherokee | Form 990 | $310,411FY2025 |
| Stanton FriendsStanton | Form 990 | $308,388FY2024 |
| Cyclone Gridiron Club IncUrbandale | Form 990 | $305,020FY2024 |
| North Polk Athletic Association Booster ClubAlleman | Form 990 | $302,091FY2025 |
| Clayton County Agr SocietyGarnavillo | Form 990 | $300,130FY2025 |
| Education Foundation of Fairfield Public Schools IncFairfield | Form 990 | $295,573FY2026 |
| West Des Moines Library Friends FoundationWest Des Moines | Form 990 | $293,839FY2026 |
| Iowa Farmers Union Education FoundationAmes | Form 990 | $293,190FY2024 |
| Iowa City Public High Schools Parents and Boosters ClubCoralville | Form 990 | $290,675FY2025 |
| Williams Center IncOelwein | Form 990 | $287,756FY2025 |
| Greene County CSD FoundationJefferson | Form 990 | $280,131FY2025 |
| Clinton High School Band Boosters IncClinton | Form 990 | $264,052FY2026 |
| Dallas Center Grimes Education FoundationGrimes | Form 990 | $260,449FY2025 |
| Sioux City Public Schools FoundationSioux City | Form 990 | $259,217FY2025 |
| Central Saber Athletic Booster Club IncDe Witt | Form 990 | $256,894FY2025 |
| St Thomas Classical AcademyWest Des Moines | Form 990 | $256,845FY2025 |
| Des Moines Consistory Building TRDes Moines | Form 990 | $251,996FY2024 |
| Joyful Noise DaycareGrundy Center | Form 990 | $251,929FY2024 |
| Bettendorf Public Library FoundationBettendorf | Form 990 | $248,037FY2025 |
| Homegrown Christian Learning CenterOsceola | Form 990 | $247,753FY2026 |
| Des Moines North High School Booster ClubDes Moines | Form 990 | $243,744FY2024 |
| Iowa Association of Christian Schools FoundationWest Des Moines | Form 990 | $239,788FY2025 |
| Quad Cities Latino FoundationDavenport | Form 990 | $239,751FY2025 |
| Entrepreneurs OrganizationIowa Falls | Form 990 | $239,142FY2025 |
| Iowa Automobile Dealers FoundationWest Des Moines | Form 990 | $236,166FY2026 |
| Escucha MI Voz Iowa Catholic WorkerIowa City | Form 990 | $234,190FY2024 |
| South Central Iowa Independent Living Center IncOskaloosa | Form 990 | $233,493FY2024 |
| Marshalltown Education Partnership IncMarshalltown | Form 990 | $232,086FY2025 |
| Shenandoah Iowa Education FoundationShenandoah | Form 990 | $232,003FY2026 |
| Iowa Independent School Tuition OrganizationDes Moines | Form 990 | $231,257FY2025 |
| Iowa City Unesco City of LiteratureIowa City | Form 990 | $230,357FY2025 |
| Meliorem Vitam IncClive | Form 990 | $230,000FY2025 |
| Mississippi Valley School Tuitionorganization IncDavenport | Form 990 | $229,882FY2025 |
| Mason City Mohawk Booster ClubMason City | Form 990 | $228,984FY2025 |
| Grand View Christian School Foundation IncDes Moines | Form 990 | $228,784FY2025 |
| PCM Athletic Booster ClubMonroe | Form 990 | $227,914FY2025 |
| Prairie Rivers of Iowa Resource Conservation and Development IncAmes | Form 990 | $220,493FY2025 |
| Iowa Skilled TradesJohnston | Form 990 | $218,882FY2024 |
| Green Castle Aero Club FoundationOxford | Form 990 | $215,223FY2025 |
| Belle Plaine Community SchoolBelle Plaine | Form 990 | $214,839FY2024 |
| Iowa Ambassadors of Music IamCedar Rapids | Form 990 | $214,120FY2023 |
| Allamakee Scholarship Fund IncWaukon | Form 990 | $212,811FY2025 |
| D A R E Iowa IncDenver | Form 990 | $210,680FY2025 |
| Isu Gamma-Lambda Educational FoundationClive | Form 990 | $210,414FY2025 |